vBulletin script help

I just came back to the scene, and been away since megaupload went down so I forgot some stuff.

I need a little help on getting a vBulletin forum working, I am use to working with vBulletin 3.x and now getting into 5.x so I was wondering what are the installing changes? Once I upload the files which are the files I needed to edit to get my forum up? If there some guide I can follow, or someone here that can help me?

Just need help installing the script is basically where I am getting at. :)

Greatly appreciated, thanks.