Never do more than one injection per visit..
The vaccine should only have one antigen in it..
No multivalent vaccines, too many unnecessary antigens in them and too many given at one time, it stresses and weakens the immune system..
Personally I like Dr. Pitcairn's schedule:
Canine Vaccines and Vaccination | Dog Vaccination Schedule
This is one of many helpful articles you will find if you research vaccines:
Vaccinating Dogs: What Your Vet Hasn't Told You
Good luck .....