Hello there !
First of all, 150-160 lbs is pretty imprecise, I'm sure you can do better than that
Now, there are many good exercices you can do for the body parts you mentioned, the most important is that you be regular at training them and that you eat well and rest well. Also, even if you specifically would like to improve these muscles, you should still train your whole body to avoid muscle imbalance and to promote muscle growth everywhere. Good exercises for the body parts you mentioned include :
biceps : barbell curls, dumbbell curls (standing or seated incline), preacher curls, supinated chin ups.
triceps : dips, close grip bench press, lying tricep extensions (skull crushers), dumbbell tricep extensions.
shoulders : shoulder press (dumbbell and barbell) and laterall raises.
I'm not a big fan of doing specific exercises for the forearms but they won't lag behind your other body parts if you do movements such as heavy deadlifts, bent over rows, shrugs, pull ups, and basically any movement where you pull, plus simply carrying plates and dumbbells accross the gym. You could also do reverse curls and hammer curls.
Note that doing bench press (barbell or dumbbell, incline or flat) will give a workout to your pecs, shoulders and triceps all at once, so that's definitely an exercise you want to do.
If you don't know what some of the exercises look like, just go to this great website :
http://exrx.net/Lists/Directory.html
Of course don't forget to abuse the search function from the forum and read around here.
Is that the kind of advice you were looking for ?
Bodybuilding advice
