Hi! The main difference would be that the G string is wound, which it usually isn't on electric guitars.

The most common string gauge for steel-string acoustic guitars (doesn't matter if they have pickups or not) is what you would call "twelves", or .012s.

This just refers to the thickness of the top (thinnest) E string. Some beginners might think that's too heavy, and use .011s instead. If you strum really hard you might want to use .013s.

Hope this helps! /Ben