convert custom indicator to EA (expert advisor)

Hi .. I have a custom indicator that gives sell and buy alerts. I want to convert it to EA that convert these alerts into orders as follows " @@ when a buy signals comes, opens a buy order. Up arrow make option to buy at tick or close of bar @@ when a sell signal comes , open a sell order. down arrow make option to buy at tick or close of bar depending on these two rules above : @@ Magic Number @@ the the maximum opened orders at the same time is always only one trade. @@ I have to be able to set a default lot size to the orders. @@ There needs to be a built in stealth trailing stop , take profit and stoploss @@ Entry Slippage note : when the ea is launched it must check if there is order opened or not, to make sure not to open more the one order at the same direction. ## what I need is to convert the code itself from an indicator code to EA code ( the use of icustom function is not allowed ) ## @@ the ea needs to work with the 4-digit metatrader, and the 5-digit. you can contact me if any further information is needed .