You will need at least 2 litter trays for 2 cats, and find out what litter the breeder uses and use that at first.
Beds are a waste of money, they will decide where they want to sleep. I bought a really nice bed for mine, over 3 years down the line they still refuse to go near it! An igloo or 2 however, may go down well as they like to hide in there.
Scratching post is absolutely critical, and combining that with a large cat tree (if you have space) can be good.
Food - again find out what the breeder is currently feeding them & start with that. If you want to change it, do it slowly over time or the consequences could be very messy! Make sure you get ceramic or metal bowls for food & water, as plastic seems to taint the taste of the contents.
Don't even think about using disposable cardboard carriers, the last thing you need is a pair of scared kittens running about loose in the car! You can buy one adult sized carrier for now and put both in that until they outgrow it. I would suggest one with a top opening as well as a front opening, and ideally one where you can remove the entire top half if you want.
Start out with them confined to one room, and give them time to come out & come to you - be warned, this can take a few days with some cats, though minutes only with others. Spend time with them talking quietly, and again let them come to you.
Don't forget insurance! You really need Lifetime insurance in case they develop an ongoing illness, and think long & hard about the max limit per year as operations at vets can be VERY expensive!
Finally, remember the Litter tray rules - kitten pics are mandatory 