[Bagger Lance]

However, do you think using creatine would be helpful? - Im obviously going to use protein supplements but never used creatine before....

Creatine is a naturally occuring food supplement and it won't help you produce much noticible size, but will give your muscle tone a little more fullness. Some will argue that its primarily water retention for the muscle cells, but once you start taking it you'll notice your volume of water intake will rise. The primary benefit for strength athletes is it increases muscle endurance, which thereby exhausts more muscle fibers which causes better gains during recovery.

I take approximate 5 grams with my protein shake during workout days and during recovery when I feel I need it. You can saturate your system temporarily with 20 grams for the first week, but staying at 20 grams is a waste of money because your muscles can only absorb about 5 grams per day.

You can get enough creatine and protein in a regular diet, but you have to monitor what you eat and I'm just not that disciplined. A protein shake taken within an hour of your workout will give you the most benefit. I'm a strong believer in supplements if your diet is not always consistent and of lower quality.

You will probably benefit from a high calorie protein supplement formula to gain a few pounds. When you lift weights, you not only burn calories during the workout, but you also burn calories post workout as well, so your daily caloric intake needs to be much higher than normal. If your body doesn't get enough calories from your diet, guess where it finds them?
Fat and muscle.
I doubt that you have much fat to burn so you definately need to consume more calories.

I understand your dilema; at age 21 I was very strong for my size, but it didn't show very much. I was 5-9, weighed 148lbs and was a National Class weight lifter (320lb bench/405lb squat). I had been working out for four years to get to that point, but not gaining much weight during the process. Looking back I realize it was my diet. I simply wasn't taking in enough protein and calories. I was never a big eater back then.

I stopped training for over 20 years and gained nearly 50lbs until recently taking it back up again. I turn 50 next year and my birthday goal is to take up where I left off and see if I can be stronger now than I was then. My bodyweight will stay between 175-185lbs.