I have questions about my bunny! I'm a new bunny owner. So here are some questions. I have a French Angora Bunny named Bessie.
1) How can I train my bunny to stay out of my guinea pig cages?
Ideally they need to be kept completely separate so the easiest way to do it is to block it off. I am not sure she would learn she was not allowed them and actually followed that rule unless the guinea pig showed her that she was ot allowed in there (through fighting or aggressive behaviour) and that's obviously not something sensible to try. Far easier to block it off.
2) do I brush my bunnies tummy and how would i do that?
This article about Brushing and Grooming may be useful but because an Angora is a specialist breed with amazing fur it might be worth posting in the Rabbity and Showroom forum and asking for their advice. Did you get any advice from whoever you bought her from?
3) How do i clip her nails?
Hopefully this article about Nail Clipping should help.
4) How should i pick up my bunny?
This article about Lifting and Handling a Rabbit should be of use to you.