Sorceress
Level 1-12: Make due with fire bolt, merc and melee attacks. Skill 7-8 pointsin static field for easy boss battles.
12-30: Fire ball+static field, teleport. Static should be max or near. Very overpowered skill in normal and nightmare.
30+: Hydra
50+: Frozen orb
Do nightmare baalruns until level 75 at least, that should be a good 50-100 runs if solo and should give a good gear base for hell mode. When ready, advance straight to hell diablo and do diablo runs, until geared enough to do hell baalruns. Use reskill when going to hell mode, static field becomes less important and strong main skills is vital.