We're so glad you've decided to give cloth pads a try, and we think you will be, too!
Here are some informative links to get you started
The Cloth Pads Livejournal Community: An excellent resource for asking questions
Obsidian's Reusable Menstrual Products Site: A comprehensive overview of alternative menstrual products
Cloth Pad Reviews: A forum of reviews of different brands of cloth pads
The Cloth Pads Wiki: An editable wiki with information on all cloth pad sellers and a search-able tag list
If you're going to start making your own pads. . .
The Do-It-Yourself Pads Livejournal Community is a great place to ask any questions you may have.
There's a lot of general advice to think about before you start at Obsidian's DIY Pad Site, including a guide to materials.
You can get lots of free sewing patterns (and pictorial guides) at The Cloth Pads Wiki's Pattern Hub.
