First you must start with a good protein and high-quality, high-potency mutivitamin. Either GNC's Mega Man Vitamin Shoppe's Ultimate Man - they are exactly the same; Vitamin Shoppe is cheaper. No centrum.
Now get a good **basic** protein powder. You really never need more than the basic. Powder is much cheaper than bars, and a ton cheaper than RTD's (ready to drinks). You should take your protein one-two times a day, with one of them being directly after your workout. Don't waste your money on Nitro-Tech or even EAS Myoplex Deluxe (haha -- expennsiveeee). Just 40 grams of protein once or twice a day - usually two scoops of a basic protein, and there is usually 70 to 90 servings of 20 grams in most basic protein powders. You will buy lots of protein, and a little money adds up quick.
if you are already doing that, then you can take no-xplode; it works well for some, and some it just doesn't agree with their stomach.
Creatine? No. No need. Spend the money on some basic Glutamine powder - it costs almost the same (it's a little more), but will do a lot more for you, and significantly improve your results. If you had $30 to spend you could get some glutamine powder that would last you a couple months at least.
Glutamine is an amino acid, one of the many non-essential (you don't need it to survive) amino acids that make up protein. However, by taking glutamine you will notice a significant decrease in both muscle soreness (a good thing) and recovery time (a great thing).
Amino acids and BCAAs (Branched Chain Amino Acids; there are three, Isoleucine, Leucine and Valine, which all three your body has an increased need for with age) options, however with the same money you could buy a good supplement.
A great supplement, however, that does have a significant amount of glutamine (2.5grams or so) and also some creatine is the only pill form of creatine you should ever take. This is because this supplement, Anavol by NxLabs, is on an extended time release that allows for 100% bioavailability. This is the only creatine that can be absorbed completely. I have found by me and countless other thousands of bodybuilders I have talked to that this is a wonderful supplement to take.
Depending on your body, you may want to look into a testosterone booster such as T3 bu NxLabs or T-Bomb. Also anything that is only Tribulus Terrestrius will have a positive effect on you. However, if you are prone to fits of rage and snapping at dumb stuff without taking a testosterone booster, you are best to stay away from anything that calls itself such. You will likely snap your chain and hurt someone or break something important in rage. I have heard many stories, and I have my own. Some of us already have too much testosterone.
P.S. I no longer work for any nutrition stores, so I am not giving you a sales pitch. Just the truth.
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Now, go work out at MINIMUM 5 days a week. Do not leave more than one day in a row off (i.e. do not take off for the whole weekend). Stick to it. You will get big, provided you do nothing stupid that gets you injured. If you are afraid of that, then go get a Personal Trainer, even just to show you the basics of form and detailed workout programs.