I recommend you talk to your county extension agent about this. They will know what diseases and strains of diseases are prevalent in your area, where you can get the vaccines or services you need, and what's involved in giving the vaccinations. Tell them how you plan to manage the chickens. If you plan to show them or go to chicken swaps where they are exposed to a lot of other chickens, I would highly recommend fowlpox and Marek's, but let your extension agent tell you which others. Are you going to have a closed or open flock? That may help against certain diseases but it is almost impossible to keep wild birds away and they can spread certain diseases. Talk to your local agent.
I set up my vaccination plan after talking to the county extension agent's office and the veterinarian they referred me to at no charge. My plan will be different than yours, even if we were to plan to manage the flocks the same as the diseaes are different. For example, the most prevalent strain of Marek's here primarily attacks the legs and sometimes wings. In certain parts of California, the prevalent strain of Marek's primarily attacks the neck. Both kill.