Three meals per day at his age and regulate his body condition to determine if he needs more or less. For the first week I usually feed things like chicken necks, chicken quarters, maaaybe chicken wings if you watch closely and they don't inhale them. If he has a tendency to want to inhale, stick with the bigger chicken quarters. If they give him runny poop, take the skin off - the extra fat can sometimes cause runs. It stays pretty basic, no organs until you have healthy,firm poops that first week. Then the next week I'll start adding in TINY portions of liver with the meals every day. Build up the amount of liver until you have the usual ratio of bone to muscle to organ - 80% muscle meat, 10% bone, 5% liver, 5% other organ. Then you can start adding in different chicken organs (heart, giblets, feet, lungs, etc).
I usually keep dogs just starting raw on plain chicken for about 2.5 weeks before adding in any other types of meat. And from there I usually go to beef or pork.
Additives are largely up to you. I feed prey model raw, which does not include fruits or veggies as part of a regular meal plan. Now, that doesn't mean my dog never gets fruits or veggies (no one denies Kaiju his frozen baby carrots), he gets them as treats. They're just not a regular part of his diet. I would wait until you have healthy poop and he is eating full raw meals (bone, muscle, and organ) before putting in additives, just because you need to know that poop is normal because the meat is balanced, not just because he's also eating pumpkin.
Once he is eating full meals, you can add nothing or several things. I personally like to add a whole raw egg, cold-pressed coconut oil, goat milk, and occasionally some plain yogurt. I added a multivitamin plus hip/joint care supplement for a while, but just ended up feeling it was unnecessary, especially when feeding things like chicken feet and cow snouts that are so naturally rich in glucosamine and chondroitin.