Do 1 exercise at least for each muscle group:

Biceps - Barbell/Dumbbell Curls
Triceps - Cable Pushdowns / Skullcrushers
Chest - Incline Bench Press / Dumbbell Flies
Upper Back - Cable Rows / Dumbbell Rows
Lats - Pull-ups / Pull-overs
Erectors - Good Mornings / Hyperextensions
Hamstrings - RDLs / Leg Curls
Quads - Squats / Leg extensions
Abs - Sit Ups / Hanging Knee Raises

Don't bother with calves or forearms until you stop looking like shit.

Good luck.