How long should I wait for a facelift after jaw surgery?

The best sequence for surgery in this process is to first set the hard architecture which is the jaw bone. This structure supports the facial skin and soft tissues. Therefore if the bones are set in proper position, the plastic surgeon can then more accurately position the face and neck soft tissues leading to a better long term result.

Complicated question, but a good one. I would definitely proceed with the orthognathic surgery first. There is also the additional timing for bone healing plus bracing.
Your idea of the doing the rhinoplasty after the initial jaw surgery is certainly an acceptable approach. Don't schedule the two procedures too close together. Postop, I would use Lovenox therapy (low molecular weight heparin shots) to prevent postop blood clots. Check with our oral and plastic surgeons about this. It is safe and can prevent major problems postop.
Then, proceed with the facelift (and other ancillary procedurs) at an appropriate time. Again, wound healing and safety is your major concern.
Get other opinions so that the procedures can be coordinated with all of the surgeon for the ideal results. Good luck! 

Facial aging happens because of 3 main reasons.
1. We lose fat as we age over time.
2. Skin loses elasticity.
3. Bone is absorbed over time.
Surgical decisions are made based on anatomy, age, skin type and bone structure to start.  I would recommend facial fat transfer and superficial laser or radio-frequency depending on how much downtime you can work with. For the jowls we need to tighten the skin and muscle. For the neck we need to tighten the platysma and do a submentoplasty (under the chin incision).  The best thing to do is find a surgeon you trust and go over your goals slowly and clearly.
Hope this helps.
Best of luck,
DrC