Default Some noob questions...

So I finally got a Treo and of course I want to mod it like every other phone I had. I have a couple of questions so hopefully no one will mind helping me out.

I installed the "official" AT&T WM6 ROM and would like to remove some of the apps or links in programs. Like the Get TeleNav and a couple of other ones. How can I go about doing this?

Also for now I am using AT&T Prepaid until my Sprint/Nextel contract runs out in a couple of months. So after each call or web session I get a notification for my balance and what the transaction cost me. With a Razr I have I can remove that option by doing a seem edit? Is there such a thing or way with the treo, maybe a reg edit?

Would you please provide any links to programs that can help me mod the phone. Maybe something to make different themes or whatever else?

Thanks in advance. I searched around but it is like 2:30 AM here and I can't see any more.