Need help developing an Expert Advisor to execute automatic trades

I need the robot (EA) to send orders only between 7:00 AM GMT (One hour before london open) till 7:00 PM GMT (1 hour before NewYork close)

The entries are based on Engulfing Patterns (Sell after bearish engulfing pattern and buy after bearish bullish engulfing)

Any timeframe that i select (As example i need to run it on 5min, and next week if i decide to run it on 1hr chart i should be able to do that ) Or if there is anyway i can define the timeframe inside the code

One open trade at any single point of the time

I have 3 risks (riskstage1 (0.25% or initial deposit), riskstage2, riskstage3)

This risk is fix regardless of account fluctuation

So if from the beginning i have 1000USD account and the risk was 25$ this 25$ will not change if account will fluctuate

Risk to reward is 3 to 1

I should be able to run it on JPY pairs as well considering JPY pairs are 3 digits not like EURUSD as 5 digits

Stop loss should be 5 pips under the low of bullish engulfing pattern or 5 pips above the high of Bearish engulfing pattern

Take profits should be Risk x 3 (Because i have 3 to 1 risk)

I have 3 risks, stage1 stage2 and stage 3

I need to move stop to break even as soon as i have 1 to 1 risk to reward. So if im risking 25$ as soon as the profits of the trades is at 25$ i have to move my stop loss to entrie price

One open trade at a time

And next trade risk should be taken based on previous closed trade outcome

I can explain more details via zoom or chat

Thank you