Sounds like you may have some issues with your TMJ (Temporomandibular Jaw Joint). It is not a wise idea to undergo either Orthodontic or Orthognathic treatment until you have an evaluation of your jaw joints. The best person to evaluate the health of your joints is an Oral Medicine...
From the picture you sent it appears you have a complex bite problem. When teeth have to be removed to correct crowding it is rare for treatment to take less than 18 months. In very severe cases 30 months may be required. You can help shortern treatment time by keeping all your appointments and...
Yes they can and it is a very important movement is some orthodontic treatments. Since your son is 11 years old it may be best to wait till all the permanent arrive and then start his orthodontic treatment. Be sure to go to an ADA recognized orthodontic specialist as these type cases...