I need an EA that opens and closes order according to already subscribed signal

Hello, I am already subscribed to a signal, which provides good and profitable but few signals.

I need an EA that detects when an order is opened by the signal and opens an identical one and closing it when the original one is closed by the signal itself.
I also want to be able to decide the size of lots being opened by the EA.

‌T‌hanks,

A‌lberto