I've never changed out my strings before but my A just broke and i'm a little confused on which gauge I need. If it helps at all I play a les paul, rarely go out of standard tuning, and play mainly classic rock.
I would recommend 10's
Yeah .10's are probably the way to go if you don't really want and drop tunings.
replace them all!!!!!!!!! I do once every couple of months. string gauge is up to you if you like bending and vibrato alot then go a little lower if you just beat the hell out of power chords and could care less about soloing get a higher gauge string