Inscription Leveling

Here's a step by step guide to level Inscription, which also includes a lot of background on that skill.

To check out all of the Inscription recipes that are available, just go to WoWhead.

WoWwiki also has a guide that includes some of the various patch changes over time and other details.

Shockingly enough, Battle.net also has a page on the subject. 

Practicing Inscription