In person HS after 6 yrs online what sport?

I want to join a sport but I don’t know how the whole thing works. I did online school since quarantine , and there was no clubs, sports, or any extracurricular or opportunities to get involved.

I don’t know how clubs, sports, and how extracurriculars work. I only just recently learned that sports have this thing in September??? where they just ask a bunch of people to join their clubs and stuff. And I DIDNT EVEN KNOW that sports had certain seasons that they’re in.

I wanna join a sport but I have NO experience, like ZERO, and no knowledge. I was thinking of track, but I have to try out for a team or something. And….. I’m not the most athletic person because of much I stay inside. And I don’t really wanna bother anyone because of how unathletic I am. I was also thinking about tennis but do I have to buy a tennis stuff?? I don’t even know if i’ll commit to it, and I don’t know how tennis works.

Everything is just so confusing, and I sound really stupid. But I never really had anyone to talk about to this especially since I have older parents, where everything was different. And whenever I ask them about their high-school days, they just don’t remember.

Please let me know, I’m super confused about everything.