How Does It Feel the First Time You Smoke Up?

my friend told me people don't feel anything at all the first time you smoke weed, is that right?
my first time will be this halloween and i would want to be high. will it make a difference how much i take the first time?
also, my sister was giving me shitt about how it makes you stupid or forgetful for a whole month if you only smoke it once, is that correct?
also i would like to have tips from experienced people.
thank you guyss

Suggestion:

That's not true. The first time you smoke weed you'll get super baked so you shouldn't do it on Halloween. You won't become stupid or forgetful unless you do it every day for at least 2 months.

Warnings: Do it in someone's house with people you trust and make sure one person stays sober incase you need help or if you find out you're allergic. My friend started puking up blood cause she's allergic to weed. Also weed isn't harmless, it has extremely high levels of THC nowadays, not like in the 70's when it was healing. Don't smoke out of a soda can, get a joint, pipe, or preferably a bong. Be careful because most people think they're 'in a dream' their first time, and they do stupid things because they think there will be no consequence. Do not make this mistake.

Good effects: You'll feel amazing. You'll have great concentration, I am an A+ student when I'm high, but when I'm sober my grades go down to less than 50%. You'll feel happy, relaxed, like anything is possible. You'll be motivated, you'll focus on all the good in the world. You'll see beauty where you never saw it before. You'll love everything and have this amazing feeling throughout your entire body of pure bliss.

Enjoy, and limit yourself to 5 tokes max, or one bowl, or 1/4 of a joint.