Any small amount is perfect. we need to focus on lot size. as it is for practice so it is better to trade in cent account and open the entry in micro lot size. this is not time to earn. it is for practice to gather skill.
For new trader better trial with small amount of investment for early trading. With small investment we can trial for our trading strategy and fine tune to get the perfect setting. So we can have more attention on the percentage of profit not to the amount of profit. When we have the best trading strategy then we can increase trading capital for more profit.
There are no exact investment that are better for us. Just invest money that we can afford to loss and not using our daily money. This is important so when we got loss, that will not affect our daily money much. Keep focus and be discipline is needed if we want to be success in forex business.
For the new trader i would like to say trade with demo account first then when you wanna trade with live account, you can try with $50 or more than $50 will be best for you.I trade $100 first time.
If we want to trade in forex for the first time then we need to use $100 capital.This amount is very much safe for the traders of forex to invest.They can never become emotional and trade safely with this amount in forex and become successful also.