Without a initial SL, you have basically infinite risk.
You place the stop where it needs to be - where the reason for the trade is
no longer valid. E.g. trading a support bounce the stop goes below the
support.
Account Balance * percent/100 = RISK = OrderLots * (|OrderOpenPrice -
OrderStopLoss| * DeltaPerLot
+ CommissionPerLot) (Note OOP-OSL includes the SPREAD, and DeltaPerLot is
usually around $10/pip but it takes account of the exchange rates of the pair
vs. your account currency.)