How to do a single install of wordpress for multiple sites

We will have two websites to maintain. What is the proper procedure for installing wordpress to eventually maintain both sites?

I talked to someone earlier and they dropped me while helping me. He said not to use the Wordpress install from Bluehost. On my computer I did do this, but my wife hasn't installed Wordpress yet.

How can I undo the Bluehost install of Wordpress and Upload Wordpress as he suggested to be done?

Once again I was left hanging without getting the help I needed! Please someone help me through the entire problem here.

Thank you
Doug