Hi
As for the wordpress install to cover multiple sites, just install it as a multi-site (the instructions on how to do this are in the wordpress codex manual online)
http://codex.wordpress.org/Create_A_Network <-- This might help, if you're unsure on how to do this I can do this if required.
I'm not going to be able to really help with your other questions unfortunately as I've not dealt with having to do this to have much knowledge of the process with ccbill
Kind Regards
Rob