It all depends on you. How much can you afford, and if you lose all the money by trading, you will not suffer any major loss. It's all up to you. You can start trading with 10, but trading with this amount will not give you much result. This requires building your own trading skills first and trading with a good amount of funds. I would suggest you to start with $ 100- $ 300, check your trading skills first. If you get good results, then the investment will increase further. Of course, invest in trading as much as, you can afford to lose.