Food is fine
Water bottle is fine
Hay, you want unlimited alfalfa for a kit in addition to the timothy, once they are adults then primarily timothy with smaller amounts of other hay. Alfalfa should be limited to an occasional treat for an adult.
Bedding, tile works, but that means you will have to get tiles cut to fit the cage, as well as you still would need somewhere for them to pee. Most chins pick a spot to pee and you can then just put a pan (a glass baking pan works well) full of kiln dried pine or aspen shavings for them to pee in. The other option is to get or make fleece liners to cover the pans the cage comes with. The cheapest option for fleece is to get fleece throws at walmart (I've heard they are as cheap as a couple dollars in the US), and if you can't sew you can just fold them over the pans and use metal binder clips to secure them. Or get metal pans (they are expensive) from Bass Equipment to replace the plastic pans.
rabbit cage pan, cage trays, cage pans
Temp is good, just keep in mind that an AC unit is
required it's not just something nice to have, so make sure your parents are onboard with you turning on the ac as needed. The humidity also needs to be kept down, 40-60% is ideal range, the ac should help with that.
Cage is good, since you are getting a kit I would block off one unit for now, then open up the whole cage when the kit is older.
Materials in cage is fine
Chew toys are fine, but I would get more variety like I mentioned in your other posts.
Bath dust is good, don't forget the dust bath house/container
Age is not ideal, but that is just what that breeder does so hopefully the kit doesn't have any issues.
My guys favorite toys are probably the willow/vine balls and shapes, but they also enjoy hanging toys that I put drilled stick on for them to chew.
Just some things to remember for in the cage, you need a wooden or metal house, food bowl (I like
metal coop cups), and a hay holder. You can also get things like lava ledges, wood ledges, wood perches, tunnels (metal or fleece covered pvc), and fleece hammocks. You'll also want to get a scale that measures in grams to weigh the chin, often times the first sign of an issue is weight loss. It's also a good idea to put together a first aid kit, here is a basic list and explanation of each item. You can also buy premade kits from places like
Chinchilla Emergency Kits | Etsy
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Ok, the not being able to take the chin to the vet is a pretty big issue to me, it's one of my biggest pet peeves. If you can't afford to take the animal to the vet if needed then I personally feel you can't afford to have the pet. I'm not a big on annual check ups but its a good idea since you are a new owner and may not notice something is wrong before it's too late. Also with the covid restrictions some vets wont even see animals in emergencies that aren't already patients. If taking the chin to the vet if hurt or sick is out of the questions though, then I strongly advise against getting a chinchilla. If one of the kids got hurt or sick would you just say "oh well we can't afford to take it to the doctor/hospital so it will just have to suffer and die?" You also said you breed dogs, do you not take them to the vet if they get hurt or sick? You are intentionally taking an animal into your home, it's your responsibility to make sure it gets treated properly, which includes taking it to the vet if needed. You can look into getting a CareCredit card,
What is CareCredit? | CareCredit it's a special credit card excepted at most vets that you can charge the vet bill to. (I don't have it so you will need to do your own research on that, I think there are others but that is the one I have heard of). You may get lucky and the chin never needs the vet, but if they do it's best to be prepared.