Joe89,
I would strongly suggest browsing our forums here a little more as we do have a stuck thread titled How to Install Mods? (
http://www.lucasforums.com/showthread.php?t=143422) Also mod installation is ususally covered in a mods readme file, along with a brief description of what the mod does. That would be the first place to look. ;)
You could also check the Taris Upper City Emporium (
http://www.lucasforums.com/forumdisplay.php?f=645) and look for the Mods Release thread there, as they too can contain info on what the mod in question does. Don't worry you'll get the hang of it! :)