To get big you must EAT big and TRAIN big.

You don't really need to use supplements but if you're going to use them I would suggest (in order of importance):

1) a basic protein powder
2) a multivtamin (I dont' bother would over priced supp store BS)
3) creatine

That being said, don't rely on protein powder for your daily protein needs. It is good for when you need quick absorbing protein (directly before or after the gym) but otherwise you should focus on consuming as much whole/non-processed foods as you can.

To train big you have to focus on your big compound movements. Squats, deads, bench, military press. Make these your priority and you will be rewarded with strength and size.

Just my $2c.

IW