Need help from people who succeeded in approaching, on how to approach a girl?

Theirs this girl i’m interested in and i keep seeing her staring at me for some reason so i wanna try to talk to her. I’m a bit socially awkward tho and i never approached anyone before.

For info: We got assigned seats so me randomly sitting next to her isn’t a option. We are in a drawing class and her friends sit at her table so i feel even more nervous cuz it’ll be more embarrassing if i end up screwing it up. I just really wanna know what to say to a girl when wanting to get their number and getting to know them more. Please don’t give cheesy advice and i know i gotta say “hey” but what else do i say after that? plus i can’t be standing next to her seat all day either so the convo has to be a bit short.

Need help from people who succeeded in approaching, on how to approach a girl?
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