I cannot recommend enough...

..that people seriously read this:

http://www.reddit.com/help/faqs/Fitness

and if you have a sense of humor and enough sense to understand good advice, this:

http://4chanfit.wikia.com/wiki/Harsh's_Worksheet_(WIP)

Two of the best, most cited compilations of fitness knowledge come from the *kitten* of the internet.

Both these will cover just about every question I see thrown out on these forums.