MQL4: Combine 2 indicators and create Automated Expert Advisor

I want to create an EA to execute an order in each time when 5 EMA crosses with 14 EMA by double size and hedge.

Example: 5 EMA cross 14 EMA down side, execute 0.2 sell order, then when 5 EMA cross 14 EMA up side, execute 0.4 buy order, then if cross down again, execute 0.8 sell order and so on.

I want to be able to control lot sizes and when to stop executing orders and which time frames.

when reaches a specific target (profit target) close all positions or when reaches 4 hedging positions (which is maximum allowed lot size which i should  be able to modify) close all positions.

i would need to try the demo version first before paying for it to make sure the complete functionality.