Alex, Congratulations. Glad you found your bird. Chilli is a cute name.
Yes, I think all birds need a cuttlebone for the calcium it provides. They are rather soft and easy to chew up so you may want to buy several or at least know where to get more if Chilli really chews on his a lot.
Before he comes home, you need to think about his diet too so you can have all these things on hand. Ask the breeder what they are feeding so you don't have to make a diet change while he is learning about you and his new home.
Toys--wooden hanging toys are nice to place close to his favorite perch. Another to leave on the floor of the cage for play but be sure this one can be washed and sterilized easily. I buy practice golf balls at discount stores for my birds. Very inexpensive and can be sterilized. They have holes in them so they are easy for a bird to hold. Pet stores have many things to choose from, just be sure the size of the toy fits the size of the bird and doesn't have long strings to get tangled in.
Have fun with him.
Annie