I wouldn't throw a bunch of money down the drain this time, the things you should buy should be basic:
Protein powder: to meet protein requirements if needed
Creatine: should always be used, dirt cheap
: many many benefits
Cissus: joint health
That's really it. There are other things you can use to help the process like ArA (arachidonic acid), ephedrine can still be bought OTC in the form of bronkaid, forskolin may be of great help to you as it's a great help with body composition. Otherwise just make sure your nutrition is 100% as that's what will make or break your gains and goals. All the supplements in the world won't do anything if you don't fuel your body properly to suit your goals.