shoot at 30fps. 24 is ok too. more frames is for when you want to be able to slow the footage down. converting 60fps down to 30 can be quirky and will look worse if you don't know what you're doing. the easy rule of thumb is shoot at the fps you intend to display at. 4k/30 will give you great footage with no fuss.
cinematic vs normal is mostly preference. it depends on how you like your footage to look. cinematic is supposed to give you a little more background blur while keeping your subject sharp. to me cinematic makes everything look a bit "softer" like how a movie looks. try them both. my general recommendation is unless you have a strong preference for cinematic, shoot in normal.
with lighting don't worry too much about it. for the most part if you turn on all the room lights it's enough. you don't absolutely need a fill light but it does help with the shadows cast by body parts. daylight is great as long as it's behind you. try to avoid shooting towards the window.
as for setups for your phone you can go a few ways or a combo of them. the ring light with a tripod is a great start (or something more compact that can double as a pov grip like a selfie stick with tripod feet). there are brackets that hold a phone and has shoes for accessories (get one that swivels so you can shoot either horizontal and vertical) that screw onto a selfie stick/tripod if you want a more compact fill light.
alternatively there's a bracket like "phone video rig." it's a bracket with grips that hold your phone inside with accessory mounts on it for lights and whatever else. you probably don't need a gimbal, just try to keep it off your body to prevent too much shaking. any number of fill lights will work. i've used a few of them and they all work. official gopro, ulanzi, telesin, smallrig, random amazon brand, etc. it's an LED fill light. you don't need to overthink it or be brand particular. plenty of reviews to see.
