For UU1, you'll need a weapon skill (except missile) (sword is probably the best choice), Attack, and Defense. Mana, Casting, and Lore are all exceptionally useful, though not needed. A few points (like 2-3) in Acrobat and Swimming are handy. Everything else is less useful and/or highly situational (Picklock and Repair are two of the better choices from the remainder), and after getting all of the above you probably don't have many skill increases left to spend on them.
Insert, Page Up, Page Down, Home, End, and Delete are all useful. Three of them adjust whether you're looking up, down, or straight, while the other three can help adjust your elevation while flying. I can't remember which ones do which, so you'll have to experiment.