I want to build a new website for an existing website (on yahoo stores) in wordpress and then transf

Hello,

I just installed Multisite because I want to migrate all of my websites to Wordpress. Right now my main website is http://www.holocaustvideos.com and is on built by wordpress hosted on hostgator. I have another website that is hosted on yahoo stores (www.opposingforcesmedia.com) and I want to build an entirely new website for it using Wordpress and when it's done then redirect the domain name to hostgator and wordpress. How do I build a new website in wordpress for a website that already exists? I installed Multisite and multisite content copier because I want the data and template on holocaustvideos to transfer to opposingforcesmedia.

Please advise!

Thank you,
Alex