Well UG. It's been sometime since I was on here! Let alone playing my guitar. Recently work at my shop has slowed down enough to where I can really enjoy sitting down and playing guitar again. My hands seem to be really tired and sore just after a few bars.. so is there a way I can get back into the grove again after not playing for so long? As of now I'm just trying to play the guitar itself. But hand techniques like stretching or something would help. Thanks guys/gals.
I'd recommend watching Freepower's videos about posture to make sure you're not unnecessarily worsening your problems that way.

Other than that, the stretches in the Petrucci video posted by Geldin will probably help. Stay relaxed and just keep practising really - just stop if it hurts and take a break.