I just made a post to another guy on the anabolic board, and I could make almost all the same comments so I'll just cut and paste it, with a few slight edits:
You need to realize how important diet is to training. I'll be willing to bet your training itself is sorely lacking, as well. I subscribe to higher frequency, low volume training myself. I'll have hit the 2 years worth of training mark in a month or two, and will have gone from 165 to a peak of 235 (some fat but mostly muscle). Right now I'm cutting. This is all natural by the way, and I plan on never touching drugs, at least for a few more years (I'm not naive enough to claim that I'll never be tempted by that time).
Forget even isolation exercises. I rarely do them myself, and my arms are one of my better bodyparts. If I were you, I would train something like this:
The scheme will be sets of 8, and failure should only be reached on the last set. This means that the other sets should be very tough, but not brutally so. Once you make all sets of 8, add 5 lbs to the bar. If you don't make all your reps, stay at that weight. Rest 3 minutes or so between sets. Simple enough?
Monday:
Bench Press - 3 x 8
Barbell or hammer machine row (trap emphasis rather than lats) - 3 x 8
Overhead Press - 2 x 8
Parallel grip chinup (use weight assisted machine if not strong enough) - 2 x 8
Wednesday:
Deep squat (below parallel) - 3 x 8
Romanian deadlift - 2 x 8
Calf raises - 3 x 8 (if you must, but I probably wouldn't even do them)
Incline crunches - 2 x 8
Side bends - 2 x 8
Friday:
Repeat Monday
Take the weekend off, and start Monday with the leg day again. So you're always alternating back and forth.
LEARN PROPER FORM. Many of these exercises (especially deep squatting) can be injurious if you neglect your form. Don't cheat on form, you'll regret it.
As for diet, we're shooting for 20 times your bodyweight in calories. This is almost 4000 a day. We're going to go for around a 40% protein, 30% fat and carb ratio. Try and limit your junk intake, but don't be super strict (i.e. get 2 double cheeseburgers from McDonalds, but forget the fries). Protein shakes (and toss in a tablespoon or 2 of extra virgin olive oil for healthful fat and upped calories) will make it easier to meet your caloric goals.
Supplements: A good multivitamin (I use twinlab dualtabs), a Vitamin E liquigel (2 of these a day, again I use twinlab's). Perhaps Vitamin C. I want to keep it fairly simple. Maybe creatine as well, but you should be spending extra money on food instead of supplements.
Once you get in the habit, I guarantee that your weight will EXPLODE if you follow this routine religiously. I wouldn't be surprised if you put on at least 30 lbs in 6 months, with little fat.
If you really want to and won't have it any other way, you can add a set of barbell curls to the first day.