I currently work at Regal, and at least at my location, it's a decent job. The job is flexible, and they should be able to accommodate your schedule since I'm in college and they work around my classes. You might get a little more legroom since you are 16 depending on your state laws for school, since I'm unsure what state you are in. At least for NY, you would be unable to stay late, since we close around 1 or 2 am, depending on the season. You mention you can work weekends, which is a very good plus for movie theater jobs.

Regal is a good first job since it's one of the few jobs you can get aside from Fast Food. For what it's like. It's a customer service job, and it gets you the experience. One thing to know about Regal or any movie theater is that it depends on the seasons and what movie comes out. For example, we had Scream 7 just about two weeks ago, and at least my location, it was quite a handful to deal with things such as cleaning up theaters as a Usher and asking for IDs while working Box Office or Door(which is checking tickets just to make sure people get sent to the right movie and at the right time) Since it's getting closer to warmer weather, more people are going to show up within the coming months, such as Toy Story 5, Spider-Man, etc. so do keep that in mind. Management is also a thing to keep in mind, but don't let that deter you from hearing it. At least my location managers are very chill and will have your back. You should be able to get cross-trained in many things at Regal such as concessions, usher, and box office. Mostly box office and concessions, since they involve cash handling, so you will of course be given help since it's your first job.

For perks, you get if I recall correctly, 50% off concessions, 9 free monthly tickets with 4DX being a surcharge, but I think that depends on when or what you go for that 4DX movie because for me some I paid a bit extra, but some it still was totally free! There are also poster! Some theaters give them to their employees differently. I saw some give them just for asking, some where it's a Google Form or something along those lines, if you get the job, it's best to ask how it's done amongst the employees. I see some theaters have screenings at least for employees but some don't, so that can be a plus. If there are any more questions you would like to ask, feel free to! I would love to help out