I’m hoping to make scuba a new hobby.

Don’t worry about getting all new gear, you can rent everything when you get your stuff.

However, I would reccomend getting Mask, Snorkel, and Fins at the least. Also maybe look at a wetsuit and boots, depending on where and how often you’ll be diving in certian tempeatures.

After you get that stuff, I’d look at getting a Boyancy Compensator, weight belt, and regulator (containing first stage, second stage, octopus, BC hose, and depth/pressure gauge) in whichever order you can afford.

Always get your tank last, as it’s not that much more to rent one than to fill it up.

that’s all you need for basics, other gear that you can get include dive knives, lights, cameras, dive computers, and writing slates, and just about anything else you can think of. You don’t need any of that, but it’s always fun to have new toys.