Base on my opinion nothing really last in this world so one day, i hope not in the near future, bitcoin will end too. And maybe it can be replace. It's never too late to invest but I think you just need to wait a little bit for the right time to do it.
There are chances that bitcoin will be down especially if it lost it's big investors

All you need to do is chill down, it is completely normal. The going up and down of the price of bitcoin already happened that is what happening right now. Bitcoin price is volatile and as a bitcoin user it is really important that you know about this. So don't do panic selling and just wait for the bitcoin price to rise again

Bitcoin can already be use as a payment system now but for now they are only few that accepts it. But I think if bitcoin is more regulize and it's price is more stable then it can be really use as a payment system. One of the problem of bitcoin is it's volatily, it's price changes time to time and it can be big or small. But my point is every thing has a certain value. So how can you buy it with something that it's value changes in just a short time.

I think for a newbie it's better to get more information about bitcoins. And I wouldn't suggest mining too. If you really need to choose between mining and trading I'd pick bitcoin trading. It's only bacause mining now is really hard and it needs great knowledge and high-powered machinery to do so.
But if you want, there are still other ways to get bitcoins. It's through ptc, bitcoin campaignd, bitcoin faucets and others. Just read more in this forum and do some research on your own and then you'll able to know that there are several ways to earn bitcoin other that these.

So, there are several ways to earn money with cryptocurrency.
-BitcoinTalk signature campaign: if you join a signature campaign and write posts on this forum they will pay you. Sometimes they require you to do some more specific posts and your payment will depend on the  counts of the posts that you wrote and the level of membership that you have in this forum.
-Bitcoin Lending: just like a bank you lend your bitcoins with interest but it is risky because it can be happen that the person you lent might not give the bitcoins.
-Bitcoin Trading: before you can do this, you must need cryptocurrencies first. And then you can trade your bitcoins with whatever exchange you want.
PTC websites: ptc means paid to click. So as the words say you will be paid by clicking and visiting or viewing some ads for just few seconds.
These are only few ways to earn money with crypto.

One of the good ways to keep bitcoins is to store them into a desktop wallet. Just keeping it to an online wallet can be dangerous and it can be subject of hack. On the contrary desktop wallet are on private computers and it has personal security keys unto it.
Something more secure is the hardware wallet too. Example of it is a USB drive. It is a physical device that you can have around with you.

Well I think you can start by telling them the advantages of bitcoin and what benifits you can have with it. Let them read articles about bitcoins too. Then you can tell stories of some people who became successfull with bitcoins. But I think they will be convinced more if you tell them your experience in bitcoin.

For me it's not really advisable to quit your job for bitcoin. If you haven't got enough time for bitcoin then maybe you can search for another job that doesn't take all your time and so that you can have time for bitcoin too. I understand that bitcoin is a good way too to earn money but we can't predict the future. I think it's better that we always have a plan B in life and not depend only unto one thing.

I think it depends on your earnings and what business you want to start. It’s really a good idea starting up a new business but you must be sure that it has a potential and yoh must have the right amount of capital for that business. So goodluck and I hope it you will be successful

Well, I think they say that gold is better because gold has been existed since the ancient times. So we can clearly see that gold has survived a lot for all these years and it’s price has remained stable, even in the future. While when it comes to bitcoin we can’t really predict it’s future. It doesn’t have a stable value. Gold has showed it’s consistency while bitcoin is still unproven.

Well you can earn free bitcoin in bitcoin faucets where it gives you free satoshi just by visiting their site. I’m not saying that it’s just a waste of time but it’s really a slow way to earn something. So I’d advice that keep posting so that you’d become a jr member in this forum and then later you can join a signature campaign.

I think that would be a total mess. Well those countries that will benefit will only be the rich countries. And there won't be anymore currency trading. For example you have a business and you want to go global because the monetary value of the other countries are higher so you thought that you can benifit something from it. But it would if we had only a one currency  you can't have any profit anymore. So I think it's not really a good idea having a single currency. And beside from that each country has a central bank where they decide the value of the currency of their country so that they can regulate the economic state of a country. So if the third world countries has the same monetary value of the rich countries I think the third world countries will only get poorer.

Well first you need to be atleast a jr memberain this forum. Then you need to search for a bounty campaign that you want to be part of. After that you must register to that campaign. You must first read their rules and regulations too so that you’ll know what to do

Bitcoin hasn't got a good image in some other countries but I think it is wrong saying that no country has approved the use of bitcoin. Because for example in Japan using bitcoin is legal and you can even use cryptocurrencies for payment purposes. There are other countries too like Canada and Germany that has legalized bitcoin. 

Well, who wouldn’t love something that can benifit you. Where you can earn something by staying at home and just sitting in front of your computer and posting in this forum, doing paid to clicks or investing your money. Of course I really like bitcoin. You can even do this in your free time so it’s really good that bitcoin exists

I don’t really think so that you can earn just by posting without being in a campaign. I think it’s the campaign where you’re going to join is the one that will give you salary. So it’s a must to join a signature campaign if you really want to earn something.

Well bitcoin is a digital currency so it cannot be use like fiat money. One of the difference of fiat and bitcoin currency is that fiat can both have digital and physical form(coins and banknotes) while bitcoin doesn't have a physical form. Another way to say digital currency is electronic currency. So it can only be use if you have an internet connection.

The worst thing I did was buying bitcoins when the price was still high. We'll I was really new back then. I didn't know anything about bitcoin and I thought if you buy bitcoins the amount stored in you're wallet will get higher as the time passing by. But I didn't know that the amount you converted into your bitcoin wallet will be depending on bitcoin's  price

I think the best time to buy bitcoin is when it is at it's lowest price. Bitcoin's price changes a lot so you must check it very well. Then when you see that bitcoin's price is going higher then maybe you can consider to sell them. But it's still up to you when will you sell them. You can perfectly sell them if you see that you gain a big profit from what you invested.

I think the better way to convince those people is to let them see what you've achieved from using bitcoin. So I think you must work more upon yourself. It's really convincing if they see a proof that you've got something good upon bitcoin. Sometimes there are people that want to see first before they believe. They wouldn't like to invest money unto something that they aren't sure at especially if they are not familiar with bitcoin.