Start with the official mods which are free (unlike Oblivion) and make sure you have the latest patch. Get the QuestFix mod which does what it says. The NPC replacer (gives much better faces) is good - I think the actual download is called "Better faces". Dodge script is useful if you want to play unarmoured. But my advice is to play the game long enough to see what you don't like, then find mods to fix it. I mostly used to run small mods of my own to tweak things I didn't like (one added athames for mages so that I could role-play better for instance, and another added a new race, new classes, and some racial tweaks).
M