I'm not an expert on adding mods to Oblivion but I can try and help. I would check out This Oblivion forum. There are a lot of people on there that can help you out more then I can.
I use OBMM- Oblivion Mod Manager To install all of my my mods and Wrye Bash To take care of merging mods and sorting my load order. Also it is a must to use BOSS to help put your mods in the correct load order.
Also following this persons site for setting up a fresh install and installing mods helped a lot TESIVOSItive
I can try and help you if you have any questions but the best thing to do would be to check out the Oblivion forum for help.