I’m no professional by any means and just sorta learning as I go but I have an iPhone 13 and am happy with the picture/vid quality it puts out. I would say tripod and lighting would be a good purchase to start. I first started with a ring light which is decent and affordable. but the lighting can be harsh and can cast shadows. they are usually best for vlogging type sets. I try to use sunlight when I can but I have a RBG LED light that’s very versatile and it creates softer lighting that I really like. Hope this helps!
Thank you 😊