Need help creating a simple MT5 EA based on indicators

I need an EA built base on my trading strategy. This is an indicator base strategy. We’ll be using the stochastic Oscillator. I’ll send you a short video that explains the strategy. I need you to add auto lot size compounding to the EA, so the EA needs to have switch Incase I want to use manual lot size. 

BUY SCENARIOS 

1. Stochastic main line has to cross the signal line upward from below line 30 on the 4H timeframe. 
2. There has to be a bullish Heikin Ashi candle on the 4H timeframe. 
3. Open 3 positions. Set stop loss to 35 pips and TP 1 to 30 pips, TP 2 to 50 pips, and TP 3 to 70 pips. Move SL to breakeven once price moves 30 pips in profit. 
4. The bot should open or take second entry(another 3 positions) when stochastic oscillator main line goes below line 30 and crosses the signal line upward on the 5M timeframe. Second entry should be attempted if a breakeven has been set for the first entry.
5. The robot must first close all buy positions before opening sell positions. This is very important cause I don't want hedging.
6. When the robot opens buy positions and the opposite signal comes in, the bot should first close the buy positions before opening the sell positions. 

SELL SCENARIOS 

This should be the opposite of BUY SCENARIOS.  Stochastic main line has to cross the signal line downward from above line 70 on the 4H timeframe.

Please change the Stochastic Settings to the ones below before working on the EA. 

Level

#30 oversold 

#70 overbought 

Variable                                       Value 

%K period                                      14

%D period                                        3

slowing                                            3