I think most people will suggest making a summon necro or a lightning trap assn. I have never really enjoyed making necros, so I normally pick the assn. Another really good starter is the LF amazon. My javazon looks like this: 20 LF, 20 CS, 20 LS 20 LB, 1 into all passives, and the remaining pts into Power strike. Javazons can breeze through normal and nm, and you can mf in nm cows and baals to get better gear. Good luck with whatever you make.
Hell resists being lousy kills more chars than you would believe.
NM Baal rocks until 70-75, good experience, good drops if you solo to avoid the PKs, and not a ton of resists needed.
Then take it slow questing Hell and you'll be fabulous. If you're on East, and you hit a sore spot (my Windy hated end of A2 hell cause too many cold/phys immunes) feel free to stop in and ask for help, people are more than willing to help those who deserve it.