Yeah, Oblivion is really something special. I’ve probably spent more time total on Skyrim, but Oblivion just feels more alive to me. Love the soundtrack and the dreaminess of the world. I also love the voice acting flubs they just left in the game, haha.
You can check on Nexus Mods for some general bug fixes, but I 'd say just open up the game and give it a shot. There’s just so many mods for Skyrim-- imagine a feature you’d like in the game, and there’s probably a mod for it. To keep the vanilla experience, maybe stick to UI mods and QOL stuff. If graphics are important to you, there’s a bunch of visual mods that are subtle but bring the game up to speed. Enjoy! I’ve put so many hours into that game over the years.