Hey mate,
Starting to trade is a bit hard especially to the beginners like you, and me 
So talking about the amount to be trade, I guess this tip will be the tip with almost wise man who starts on trading too, trade only the amount you are ready to lose onto, because you do not know what will be the result of your trading and it is just like investment, investing to something you do not know what will become to.
And one more thing, make some research when you trade, and think so many times on this, it takes time to do so but it is ok, as long as you are sure with what will come up. Time is not hindrances, just make timing on that.