Any aspiring magic user in Oblivion Remastered will likely want to seek out and join the game's Mages Guild. The Mages Guild can help train you in the game's different types of magic, learn new spells, and enchant your items. There are also some interesting quests to follow involving the guild that you won't want to miss out on. I joined the Mages Guild in my playthrough despite being a Knight simply because some of the introductory quests are fun and full of intrigue.