LINKS
Here's a list of (hopefully) helpfull tips, tricks, & instructions on how to do stuff. Use at your own risk!
General
DaveOsbore.com: Dave's Shop Talk
Framing
How to Frame A Wall For Home Theater Builders
Habitat for Humanity: Interior Wall Framing Guide
Soffits
How to build a soffit
Drywall
Drywall 101: How To Install Drywall
Dave Osborne's:How to Install and Finish Drywall
wikiHow:How to Tape and Mud Drywall