Make sure it is worthy to do that. I have paid 4-5 times to developers to build me indicators. No results at the end. I learned to use the strategy builders as they find the best combinations of indicators.
Also, you can not rely a strategy on single indicator, you will need to combine it, and it will get harder and harder with the time as you will need to add changes.
The method that Petko shows in most of his courses where he places many EAs in one account and separates those that are profiting currently, made me realize that it is useless and time consuming to look for solutions with custom indicator.