Either you start with a smaller or bigger amount the most important factor is how knowledgeable you are about it and what strategy you will follow to make profits and reduce the risks, and if you can manage this then rest everything will be fine with you.
That's right, the main issue is how knowledgeable a trader is and not whether the trader is trading with small or big amount, because either way, a skillful trader can always make some profit. However a trader is better-off trading with a big amount because that creates an enabling environment for him/her to survive lots of surprises the market often throws and that is besides the fact, that with a knowledgeable and skillful trader, more profit can readily be made and in lesser time, thus avoiding over trading.