eat big, lift big, BE BIG!!!!!
to be more specific...
1) if you want to be a big guy, then you have to eat like one. how do you expect to look like a 250-lb guy when you are only eating enough for a 170-lb guy??? MOST bodybuilding websites say eat 2-3g protein per kg of body weight to bulk up (more if you are cutting weight), but I stick to at LEAST around a gram a day per pound of body weight. Try to get no more than 50% of this number from shakes (so 50% shakes 50% solid foods). Is that confusing??? Say iff you were taking in 400g of protein a day... make sure no more than 200g are coming from shakes, and at least 200g of it is coming from solid foods.
another thing is if you are trying to cut fat while gain lean muscle, even though doing this is inefficient, you need to eat lean meats ie. chicken, turkey, LEAN beef, whey/WPI/casein/whatever protein shakes.
like they say... DIET DIET DIET diet is key, and I dont mean dietING, but your daily diet.
2) you need to take a good multivitamin (NOW Adam or GNC Mega Men Sport are 2 good ones)
3) I highly recommend you take EFA's (essential fatty acids), you can get what you need in this department from a fish oil supplement.
4) the only other supplements I suggest you consider taking are: creatine, nitric oxide, a decent stim fat burner (for cutting), BCAA (mostly for cutting), and thats about it. I dont take any of these right now, but ive used them before and they do their job.
5) "they" say you only need to work out every other day, but I workout 7 days a week and dont intend on changing. the key is to take at least 3 days break every few weeks or so to make sure your muscles are getting the rest they need (it takes over 24 hours for a muscle to repair itself after the fibers are "ripped apart" by those last couple reps. it still doesnt hurt to only workout every other day, who knows it might be better for your gains, just make sure u switch up workouts if u work out every single day.
6) get a good routine going. if you really want to get buff, you need to establish a weekly schedule, and keep track of how u are doing (and keep upping the weight each week/2 weeks or whatever). Most of the people ive seen just go to the gym and work out whatever they feel like end up quitting a couple months in, mostly because they just dont have a set routine they follow.
7) FORM BEFORE WEIGHT. If the weight you have on there is too much to allow yourself to do the exercise properly... then DECREASE THE WEIGHT until you can do it. Form is so much more important that how much weight you can do with this or that.
8) Get 8 hours of sleep, if not a couple more. Just aim for at least 8 hours.
and other than that, get some good compound lifts going and u should be good to go.