I need to start doing some pullups or at least attempt them

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Last night Bi's/Tri's:
dumbbell curls 4 sets 12, 10, 10, 8 @ 20, 25, 30, 40lbs
skull crushers 2x15 65, 75lbs
easy bar curls 2x15 65, 75lbs
rope pull downs transition to overhead tri extensions 2 sets per x 15 @ 55lbs
one handed preacher curls 3x15 @ 30lbs
push downs using the curl machine(?) 3x20 195lbs