Ummmmm....so you're asking us to do all your work for you basically? I'm smiling but you have to be kidding. It would take hundreds of pages to give you step by step instructions and I doubt anyone is up for that. You know nothing about Ebay or Auctiva?? Here's a good place to start for Auctiva :
http://www.auctiva.com/free-auction-software-help/help.aspx
And here's some Ebay help :
http://pages.ebay.com/education/index.html
Take the tutorials and read as much as you can. It's much easier if you start out buying first, to build up some FB and get an idea of how Ebay works.
I'm sort of kidding you here, so pls don't take it the wrong way, but I get the feeling you're about to jump out of the plane without the parachute
Please do some reading...Buy some stuff...It will get easier