There is strong support from scientific study that early active movement and mobilizing exercises is best. This is true even in the acute phase of injury.
Studies have also shown that results are best when patients have multiple sessions with direct instruction from a trained professional. This may be a medical doctor, chiropractor, or physical therapist.
The proper healing of soft tissues requires training in posture and movement. Re-training the neck joints to sense position change is also important. This type of program isn't really a do-it-yourself project.
Ask your doctor for specific advice or visit another health care professional trained in soft tissue injuries.