You made a wise choice selecting the Emerald X7.
It's a great little guitar and so much fun to play.
It's interest what folks like in the strings they use.
I don't play out so I don't need volume and don't play loud at home.
I pick and strum with heavy picks, 1.00mm and thicker
There are two strings sets I like to use:
1. Galli Jazz Flats AJF1047 Bronze Extra Lights (010 - 047) or
2. D'Addario Chromes ECG23 Extra Light (010-048) Flat wound.
I like the Galli a little better than the D'Addario and are presently using the Galli AJF1047 on my X7 and X20.