If you just learn trading then start with $50 only even if you thousands of dollars. The Reason behind this is that when you make mistakes from $50 you come to know a lot of things and your big also left behind so when you have confidence that you trades comes in profit then take that capital and start trading. If you start with big capital and you will loss then you heart says forget about trading.
If you take a trade always use stop loss and never in a hurry by seeing a bearish or bullish trend because when you take a trade you become exit liquidity.