Pentatonic for blues/classic rock. :/
You could always 'make' your own scale (Though chances are, anything you make will have already existed), or you could go into modes, as these will really spice things up.
pentatonic/blues, mixolydian or dorian modes.
My Gear:
Gibson Faded Flying V
"Dante's Inferno" Iceman
Fender Hot Rod Deluxe 112

Quote by freedoms_stain
I can't imagine anything worse than shagging to Mark Knopfler.

Maybe shagging Mark Knopfler, but that's about it.
I began with Pentatonic, and expanded from their. It's easier to learn scales once you learn all of the Pentatonics.