All right. First, I want to know this: what would you like to learn?
Here's some advice I can give you off the back though:
1. No outer glow, stroke, that kind of stuff.
2. I don't really like the Render>Lens Flare tool, I used to use it but I've realized that it's really not that good of a tool.
3. Your typography needs work, but I can't say mine dosen't ;P
4. Your banners lack... well, flow. Flow is a tad difficult to explain, it's really mastered through experience.