Sage words from all so far. Also keep in mind that at your age and size, there are only two supplements worth their salt, protein and creatine. And honestly, if you waited another 5 years to buy creatine, you'd probably be just fine. The combined lifting and nutrition experience on this board is staggering. Listen to the "old-timers" (aka been lifting 10+ years), they'll prevent you from making the mistakes they made in the beginning. Do some self-research to come up with questions, and most important, ASK THE QUESTIONS. Squeeky wheel gets the grease.
And keep two logs. 1 food. 1 for training. Trust me on this.
My Training Log
Personal tips that I've learned along my still short journey:
Leave your ego at the door.
Prepare. Showing up dehydrated, hungry, and tired will guarantee failure.
Be ready to fight for that grinder of a PR.
Listen and learn. Absorb everything you can, and assimilate that knowledge.
Top Gym lifts: