Welcome to the club im 15 years old and got my first tank one year ago, my main piece of advice about being a kid with a saltwater tank is to get you parents into it. I got my mom into the hobby early on and its been a big help. Also i dont remember reading if you said this or not but it might help to get a timer for your lights, i think i got mine at target and its been a big help for those days when you dont get home in time to turn on your lights.
Good Luck,
Connor