Just an example of one of my back routines.
Pull-ups x 5 sets
Bent Barbell Rows 4 x 12, 10, 8, 6
Superset:
Seated Cable Rows 3 x 10,8,6
Close-grip Pulldowns 3 x 10, 8, 6
Deadlifts 3 x 10,8,6
Keep track of how many pull-ups you can complete in each set and each week try to get more. For instance, the first time you might complete 5 sets for 30 total reps. The next week, shoot for more than 30. As you progress and get stronger, you'll be able to do more.
You can switch up the number of sets and reps. If you go at it with maximum intensity, this workout is pretty effective. I like to throw in some bicep work at the end. Not a lot though, as three days later I give my arms some independent work of their own.
Train hard!