As Jay said,
Supplements only do exactly that, supplement what you are already doing.
I'm on a certain diet to shred bodyfat and maintain muscle mass. I havn't bothered with supplements yet as its too far from summer and your body builds a tolerance to them, so if I start now, I need to bump up the amount by January comes.
If your looking to get big, depending on your current state, look at your diet, analyse and do it hard. It's not easy to get big and alot of it comes from diet.
Protein - Consume 1.5-2g of protein per lb of bodyweight - this will help rebuild your torn muscles after the gym and provide plenty of food for your muscles to grow with; the building blocks.
Creatine - I would not use this unless you take care of yourself; it can be dangerous on you if you dont have a high water intake and combine it with alcohol and all sorts of shit.
I would just buy some protein, whey protein is enough. Don't waste your time with the sugar coated junk, it doesnt do anything.