I own a few. The camera I recommend to most people wanting to start out with underwater photography is the Olympus TG-6. It is as simple as point and shoot. I own a few of these as they are super easy to travel with and allows me to get a lot closer to my subjects. I also own a Sony A7IV in an Ikelite housing with a Sony 90mm f/2.8 Macro Lens & a Sony 16-35mm f/2.8 GM Wide Angle Lens. Last but not least, my Go Pro Hero 8 I use this camera strictly for video and larger subjects.

I cannot recommend Orca Torches enough! They are fairly inexpensive and have a variety of different beam angles, sizes etc. Personally, I own a D910v, D530v & two SD03. I also own a Mare Eos 5RZ and a little yellow torch I bought off eBay 7 years ago and somehow it still works. For my strobes I use the Ikelite DS160 II 160Ws TTL with an inbuilt focus light. Buying dive torches, video lights & strobes is an investment. They can be awfully expensive when first starting out. When I first started my underwater photography journey I would buy $2 Bunnings torches and put them in zip lock bags. Dolphin torches are also another inexpensive waterproof torch - the only thing is they are designed to be positively buoyant.

If you are just learning to fly DJI have a fantastic range that are almost fool proof to use. I own a DJI Mavic Mini 2, a DJI Mavic Mini 3 Pro & my brother Oliver builds and pilots FPV drones which adds more freedom and differing angles when filming.