need help on home page

Hi
im testing a website www.moviedrome.info/zpress

i need help if is possibile
1) under available vodes a link that shows buy credit directly on left module not only when ur buying something and let the check on db if you are at 0 then buy credits.

2) set 0 credits when a user register on virtuemart and don't let admin insert manually on control panel

3) pay wih paypal is the only way or a user can pay also with credit card?

Sorry for my english i'm italian

Thanks

Rico