Search around outside the doctor's house....
Lockpick is handy; at least keep any items you find with a bonus to this skill. Several quests require Lockpick, though no essential ones.
Most people complete the game around a character level in the mid forties to low fifties. Using Resurrect to re-kill monsters repeatedly would give you more experience, but since the experience required to get to a level is proportional to the cube of the level, and the number of experience points is related to the difference between classes (you get less if you are much higher in level), I would think it would be difficult to get much past the high fifties.
Mage spell books can be bought (
Free skills, and spell books you can buy minor spoilers).
Warrior's tend to have spare skill points (I had 10 unused at the end of the game, spent 5 on a skill I never used and maxed out a few I didn't need when I got to the final area). Keep a few skill points in reserve.