Welcome to our forum. A couple of things concern me. First is the fact that you are breeding your female and obviously do not have things planned out properly. Are you a breeder? Or is this just a hobby for you? Are there any breeders in your area that might mentor you. You really need to know what you are doing first and foremost. You will need supplies for the birth in the event there are complications. And having newborn kitten formula and syringes on hand in the event the mother doesn't nurse properly or has 9 kittens and can't provide enough for them.
As for the price set for kittens. Are the parents registered? Are there Supreme Grand Champions in the pedigree? Most breeders do not price their kittens until they start developing and they can tell whether they are show quality or just pet quality. Breeder prices can range from $500 to over $3,000 for just a regular bengal. An early generation bengal may cost more. Do you know the F generation of your female?
Note, you must be in attendance when your female gives birth. Do not leave her alone. I know too many female who have retired an emergency C section to deliver the babies, so you MUST have a vet on notice. If this means you take off work, you take off work. There are some breeders who hold other jobs but their queens always take priority. Note, there is a post on this forum from a member who's pregnant cat gave birth to five kittens and the owner found all of the kittens dead in a closet. The owner was totally unaware the cat had given birth.
Kittens need to be seen by a vet and receive initial vaccinations. They should be weighed weekly and their weight charted. You need to know the difference between a brown spotted, marble, mink, silver, snow, etc. kitten. You need to know how to check male or female. Kittens should not leave until they are at least 12 weeks old. You should have a contract for the owner to sign. You are selling a purebred (hopefully) cat. You would need to register the litter so the kittens could be registered. Screen all potential owners and be willing to take the kitten back if the whole situation does not work out.
As for whether the money would be taxable --if you treat it like a "business" you may be able to deduct all the expenses you have -- vet visits, food, litter, etc. All of this should have been figured out BEFORE you bred your female. Only a tax person can tell you for certain how any income would be treated.
I know there are 100 other things you need to be aware of as well But they limit us to 60,000 characters.