Hieken ashi and supertrend trading bot

Hi, I'm Joseph. I'm preparing to take a funded challenge. I've already back tested a few strategies and found one that I'd like to take the challenge with. The challenge takes place on MT4 through the Eightcap brokerage. This is the strategy I'd like for someone to automate for me.

Candle type: heikin ashi

Indicator: Supertrend (length 13, ATR 1.02)

Strategy:

Long: Enter when Supertrend turns green (up). Exit when Supertrend turns red (down)

Short: Enter when Supertrend turns red (down). Exit when Supertrend turns green (up)

Risk management: use 15% of the account balance per trade 

It would also help if you made the code so that the amount per trade and the Supertrend length and ATR we're changeable. I'll be trading bitcoin with this first then, maybe stocks as well. Let me know if there's any further questions. 

Thanks,