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