Simple Expert Advisor with custom rule

Hi,

  i just need to develop an entry level Expert Advisor, this is the desired behaviour:

- The advisor MUST support hedging of positions (following the underlying rule)

- At a given level (provided by a parameter) OR at the press of a screen button (better) open a position SHORT on a given PAIR (EURUSD ...)

- At a given level of PROFIT of the previous position, open ANOTHER position SHORT (and put the previous position in STOP LOSS 0)

- At a given level of PROFIT (overall) close both positions

- If the position goes negative to a certain level, open a HEDGING position LONG (equal amount)

- The positions must be kept open at the  market close and managed again with same rules at re-opening

These are the context:

- Metatrader 4 with Avatrade

- Want to be able to backtest hystoriucal data

Thanks a lot!

Matteo