there are none that are required, nowadays, technically.

When will camera catch up to Arri cameras from a decade ago and offer 12 bit 444 compressed

What’s the bit depth, if it’s 10 bit, it’s worthless.

If you go red or arri, know that for it to be a good business decision you have to pay the red off in 2 years and the arri off in 4. So you have to have at least 30-40 working days a year where the client is renting your camera for 700-1000 per day. If you have the days financially it makes sense, if you don't it makes more sense to rent until you do. You should never lose money on a camera especially if you're a boutique shop.

Also 4k doesnt really matter, If you have the days an alexa classic thats 2k would pay it self off the fastest.

hire a key grip yo!

Get three quasar 24 inch battery powered tubes. You wont get much punch but if its just mediums and close ups it'll work

Or some apurture 120 d's but they dont have punch either, the quasars are more accepted by the industry