Adding new features to existing MT5 EA

I have an EA which trades with XAUUSD with a grid system, and I need to add a few features:

1.- The EA works with an indicator and open many trades as a grid system. I need the EA to open JUST 1 TRADE INMEDIATELY WHEN THE TREND SHOWS.

2.- I need the EA to keep that trade open until it reaches TP or the reverse signal shows. The EA has already the 'close if reverse signal' parameter.

3.- I need to create a parameter to set the TP and SL (both virtual) in money (euro).

4.- I need to keep the rest of parameters already the EA have, like trailing and close trades if reverse signal shows.

That's all. ¡Thank you!