http://www.uesp.net/wiki/Morrowind:Morrowind_for_Oblivion_Players
This is the usual link for Oblivion players. I played vanilla for years and had a great time. However, now I have several mods and the game is even better. Most mods have been play-tested to perfection and only take a few minutes to DL and install, so I would recommend that route. Good luck!