I would very seriously consider reading the Citadel Explained page before you do much more posting here, just so you get familiar with the site. However, it is very much worth mentioning right here: we are a non-system specific site. Everything we post is in a prose format, with no statistics listed. A number of us, including our most prolific posters, dislike D&D and the D20 system in general. I'm not intending to scare you off, just giving you a warning: we focus more on actual content than on blocks of numbers.
That said, I would suggest you take a look at the Wizard's forums. They've got one specifically for designing character classes. You'll find it here
. However, if you want plots, locations, NPCs, and yes, even items, you'll find thousands of them right here at the Citadel. Take'em, use'em, then come back and tell us how it went
Don't let what I've said scare you off. We'd love to see what you've come up with as a GM! We just discourage system-specific information and numbers. They tend to cause problems in 'translation' from one system to another. It's easier to use something in a generic format.
I hope to see you around the Citadel!
Edit: Looks like val got here before me. Ah well, no harm done.