Im new with CB and I need help please

[Father-of-5]

Hello, Im trying to support my family by selling my products on CB. If anyone knew the answers to these questions it would help me a great deal and Id really appreciate it:

1) Does CB's 7.5% includes the paypal fee? Or is that an additional fee on top?

2) My site sells physical products but also has an ebook section. Am I allowed to host the CB salespage on my main website/sub-domain or do I need a new site dedicated to CB only?

3) I read that "CB will only allow vendors to link to one page for multiple products"... I have 3 products which are not-related... Does this mean:
a) I need a totally new site and account for each product?
or
b) I need a new account for each product but can sell all three on the same site?

If anyone knows the answers to these questions please help me. Thank you in advance.