Binance market in my opinion is very good because it has the biggest users right now, and for good altcoins for investment like eth, bnb, link, dot, xlm are still very good to buy, maybe you can find out better than this.
I see you are more in a safe side both for your investment and the exchange that you are using.
Good advised since learning from the a much safer way is far better than taking a big risk then lose your interest after.
You will get a truckload of coins, however, it's up to you to decide which one you are going to throw your money into. Your picks should be influenced by fundamentals as your new. Look for good coins and buy & hold. This what I usually do and I use Atomic wallet for exchanging coins/tokens. I don't have to go outside the wallet, I exchange and hold my assets in the wallet.
Good point. looking for fundamentals and make sure that there's really usages behind the projects, developers and the actual support by the communities also play the big roles in any projects. Best to do deeper research then decides what next for your money.