Well I already posted my walkthrough of Journey to the Kimon using a Wizard for you. That has plenty of tips on how to survive as the Wizard. The biggest tip is manoeuvre yourself so that you never/rarely get hit. Check it out.
Mask of the Boy King is also pretty easy with the starting characters. In that one don't desecrate tombs if your health is below 30 and you should be fine. Also on the forth and fifth levels try and get a Kaonashi ally as they are strong fighters and they drop a shadeform mask when they die. Either use them to defeat the guardians or use their mask to bypass the guardian completely.
It's pretty simple once you work out the best strategy for each quest.