#1
Noob question, I've got an Ibanez GSR200 with the standard strings but what are the options regarding replacement with something else?. Do different makes/types produce different sounds or playability? Any guidance?
#2
Get the same weight strings unless you want low drop tuning or snapping strings. Do it one string at a time if you have any kind of vibrato system at all. Different strings produce different sounds but most people don't really think about that. The tone is all in your pickups and amp.

Ibanez SR506BM
Ashdown Little Giant 1000w
Peavey TVX 115+410
A big ass upright