Expert Advisor 3 Moving Average 8, 20. 50

Dear Sir or Madam,

I would like to create an EA that would compare the 8 Expo MA, 20 Simple MA, and the 50 simple MA.

When the 20 is above the 50, the EA should open a BUY when the 8 cross the 20 and close it again when the 8 closes back the 20 again

When the 20 is below the 50, the EA should open a SELL when the 8 crosses the 20 down and close it again when the 8 crosses it back again

Money-management if possible not more the 2% of the account

I am open to your questions or suggestions

Thanks