Why do you want to breed from her? What are her hip score/eye test. Has she been tested for OCD. How has she been placed in the ring. Is she a good example of her breed. And the stud, has he also had his health checks done. What is your reason for choosing this stud.
Can you afford to keep all the pups if they are not sold or have to be returned to you for any reason. Are you prepared for any medical complication and the resulting costs of a C section. Or even the death of your bitch. I am sorry to be so harsh but please look closely at your reasons for doing this.
An example. cost of stud £200. cost of feeding pregnant and lactating bitch quadruples. Cost of C section £700 upwards. your bitch only has a singleton. Maybe she produces no milk, can you take 6 weeks off work to care and feed pups 24 hours a day. Maybe your bitch will develop pyometra the pups will be re-absorped and bitch may die if not spayed immediately. Are you prepared for all of this.
Why not talk to your bitches breeder, she will be able to help you. I usually give as much advice as I can and am usually quite happy to spend a lot of time on the telephone.
As for the colour of the pups, you would need to study the genetic history of the stud back to 8 generations, If he carries chocolate gene it is not a good idea to mate him with your yellow bitch, the pigmentation and eye colouring from this mating would be very poor. Is the stud proven, you may then find what he carries, it depends on his genetics, he may carry all three colours, he may only carry one.
Please dont think too harsh of me, too many people have lost a precious and much loved bitch because they think one litter wont hurt
Kay