p90x how to get started

how to get bigger muscles? protein? creatine?
i’ve just started p90x and have begun a good diet, and i want to start a 1 or 2 sport supplements. i am pretty sure i need Whey Protein and a trainer told me i would benefit from using Cell Tech Hardcore.
180 lbs
18 yrs old
5’11”
i have no chest muscles
Max,
Make sure you get a quality chemical free whey protein. You will get great results off P90X..nutrition is #1 so dial it in…Good luck
p90x! GETTING STARTED-PLEASE HELP ME!