It is a newbie question but still.
i am bit furiated with NT8. It has all options in strategy analyzer to customize backtesting. But i havent found where I can set amount of money for single backtesting. Does anyone know how to do this?

If you are doing the backtest e.g. in SIM, the initial value can be set via
NinjaTrader 8

If it is part of your strategy, see NinjaTrader 8
Follow the notes, since you presumably will have to write some syncs of your own.