[amibroker] How to programm position sizing

["poller_martin" <poller_martin@xxxxxxxxx>]

Good morning,

could anyone help me with my basic system?
Buy on crossing 5 and 20 days EMA - buy only for 60% of equity. Stop
Loss counted from average volatility during past 4 days. 
After my profit get over my initial risk (difference between buy and
SL), buy for another 30% of equity. After my profit get over 2x
initial risk, buy the last 10% of equity.
Exits are done by trailing stop - counted from average volatility
during past 4 days.
I have done this:

PositionSize = -60;
Buy = Cross(EMA(Close,5),EMA(Close,20));
Vol = (Sum(High-Low,4)/4)/Close*100;
ApplyStop(stopTypeTrailing, stopModePercent, Vol,1, False, 0 );
Sell = 0; 

Really don't know how to continue :-( Thanks for any help..
MArtin.




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