Need an auto-stop loss placing script using the low/high of the last 10 candles, and automatic risk calculation for size

I am looking to trade the US100 index. I would like to automatically place my stop loss based upon the low or high of the last 10 candles. I.e. if shorting, the high of the last 10 candles, if longing, the low. I would like to also calculate the amount of contracts needed to risk either a fixed $usd value or a 'total account %' based risk. I.e. on a 50k account, if I wanted to risk 1% per trade, it would be a $500 risk per trade. The amount of contracts will be automatically calculated in relation to the stop loss to determine the contract size needed to match my risk tolerance per trade.