How do I prepare for a cat?

My boyfriend finally gave in to the idea of getting a kitten! I’m so excited It won’t be until July or August, but I’d like to be informed now so I have enough time.
I’ve never had a pet before, and I have just a few questions. Feel free to answer any of them:

What are the basic things that I need to buy?
How much food does a kitten need? Wet or dry? (I already know to look for good ingredients)
How do I hold it?
Does it only drink water?
Would it be ok to put a bell on its collar?
At what age is it ok to leave him alone in the house in the even that I soon get a job?

Thanks, you guys