What is that for a question?
You decide how much you want to use for trading .... Noone can help you there.

I trade between 5% to 50% depending on the currency and the price (better the tendence, is it - or is it +) of the currency at the moment I start trading.
I´m still sure it does not help you much if you know how I do my trading.
But hey , you got an answer.