well, your two most important supplements IMHO to have are:
1. a protein powder (like Truemass if you're bulking up)
2. a multivitamin

others will argue this supplement and that supplement being needed, but those two included in a clean diet and good exercise program will cover the basics.

there are different kinds of protein powders, too. usually you can just read the ingredients and you'll see them:

1. whey protein (i.e. Truemass) is the fastest digesting and is best used for pre-workout and post-workout shakes.
2. casein protein is a little slower to digest, so is great to use before bedtime.

I'll let the other more experienced members suggest other supplements to use besides the two that I suggested because I only use 4 supplements, including those two.
the other two I use, and I don't know if anyone else on this forum has tried it, is a Niacin pill + a Chromium Picolinate pill with my pre-workout shake.

hope this helps!

__________________
"The iron never lies to you. You can walk outside and listen to all kinds of talk, get told that you're a god or a total bastard. The iron will always kick you the real deal. The iron is the great reference point, the all-knowing perspective giver. Always there like a beacon in the pitch black. I have found the iron to be my greatest friend. It never freaks out on me, never runs. Friends come and go, but 200 pounds is always 200 pounds."

-Henry Rollins
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