I just got untied healthcare through my fiance how long do you think I would need to wait before I can start the lap band process

That depends on the terms of his United insurance policy. For example, the policy might not cover any kind of services until 3 months after enrollment. Call the United customer service line and ask about that, and while you're at it, ask about the policy's weight loss surgery coverage - what (if any) surgery does it cover, what do you have to do to qualify, etc.

Thanks