I was wondering if there is a required amount of bitcoins you need to have before you start trading? Also, a little out of topic, but is there a required amount that a person needs to be earning per month before he could start buying bitcoins?
You just have to check the minimum deposit of the exchange site where you want to trade. And from there you can decide how much you are willing to start with. You can buy bitcoin anytime you want no matter how much you are earning. Just make sure to study the market so you can buy at its low and make profit.