So this will be my first time getting drunk drunk, and my friend is a year older than me and has done it several times before. I could have him watch me, but there may be a chance that he’d be high/drunk too, so what are some things to watch out for and consider during my first time getting drunk if I’m able to go to his house?


Good advice here.
The faster you drink, the drunker you get and the longer it takes to sober up. Your liver doesn’t hurry things along just because you were dumb. It’s a linear processing speed. And don’t take any meds that dunk on your liver either. No acetaminophen/paracetamol.
And when your liver is busy with alcohol, it isn’t doing glucose (fat metabolism things) management. You’re likely to have low blood sugar if you don’t eat after drinking.
For weed: maybe you’ll be unfortunate like me and have a vasovagal syncope response (fainting). Alcohol enhances the effect.