Your idea of a decent account size and my idea might be totally different !! But yes you could start with a small amount but have to be very careful. I don't know your trading experience.
Always have to be careful but your risk, assuming no slippage, is pre-defined by your S/L level on every trade isn't it?
Let's say you start off with 10k and risk 3% per trade with 80% success, over 1y = 250 days your trading account will grow to ~ 3.5 mio...that's pretty decent wouldn't you say?