My recommendation is to start at least from 100-200$. Ff you will have less money on your account you need to wait a year to double it.
Your income can depend from your style of trading.
If you will trade manually you can make 100 pips a month. But, for example, if you will use at least semi-automated Forex system that will trade instead of you and can make up to 800 pips it's completely another situation. When I was started Forex I made the right choice and start automated trading with Forexeasystems.
Hope, you will succeed on Forex.
2 years of experience.