Welcome @Beamy!
As I'm sure you're exploring your area, you are very close to the Outlets, King of Prussia Mall, and Valley Forge area.
Good gun shops (meaning large with some selection) are Targetmaster near Delaware, and I think Guardian something is near there as well.
Targetmaster has an indoor range. As far as outdoor ranges, University Range is out west of you but it seems to be popular.
You're not far from me (I'm in upper bucks county), so if you get in a pinch and can't find somewhere to shoot, let me know and we can figure out a time you could come to my place.