There are two ways to switch. The first being cold turkey. This method seems to work best for healthy adult dogs. You can fast them for a day or so if you wish before you switch, but the way I would recommend is to throw away your kibble, and start feeding raw. It's that simple! Keep everything very simple for the first couple of weeks, I would suggest chicken necks/backs ONLY for the first 3 or 4 days. Make sure the dog is digesting everything properly (no diarrhea or vomiting) before you add another type of food to the meals. Hold off on all supplements for several weeks. I would also wait several weeks before adding richer foods like liver, eggs or canned mackerel.
The second method is the gradual switch. Basically you add a bit of raw food to the dog's meals each day, in increasing amounts while decreasing the kibble. This may work for some dogs, but it takes longer for the dog to adjust and there are more frequent bouts of loose stools. I would recommend cold turkey for most adult dogs and some puppies.
If you decide you will be feeding veggies, wait until the dog is eating a variety of RMBS and different meats before you add them to the diet. Remember, veggies need to be thoroughly cooked or pulped in order for dogs to digest them at all.