What sex position is the best for the first time?

I'm 17, emancipated, and I live in a tiny apartment with my doggo. My boyfriend got permission from his mom to come see me because she knew we were gonna have sex one day and she'd rather us be in a room (Which surprised me because she's strict lol) I'm on birth control but not the pill, it's a contraceptive called Nuvaring and a lot of ladies don't like it for some reason but it's best for me because I've heard pill and IUD horror stories. My boyfriend is coming over tomorrow and we're having sex for the first time. I really don't wanna stay in missionary but I also don't wanna do anything that's for more advanced people 😂. So vote please and any other tips or advice is much appreciated

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