No offense but it's completely not worth it to start trading with that amount. Getting a sizeable profit in trading needs time and your profit depends on your investment, with only 50k satoshi you'll be wasting your time for few cents.
It's a good place to start though! It is very good for experimenting with the profits that can be earned from trading without a large loss involved.
@OP - the main things are to buy coins when they are at a low(er) price and sell them when they are at a high(er) price. The limits of what is high and low is based on your own personal opiinion though, and I'd advise you at least try to do something simulated initially so you can see if you have a good strategy that can be used for trading.