I have no chin and snore like a beast and if I gain weight, I develop a double chin. What's the best procedure for me?

 It is difficult to answer your question without photographs.  However, the scenario that you present suggests that you could possibly have obstructive sleep apnea.  A person that has, "no chin," typically has the jaws set back in relation to the cranial base. This presents as microgenia ( small or no chin), an obtuse thyromental angle (the profile neck angle from the thyroid cartilage to the chin - which also causes a double chin with weight gain),  and severe snoring.  I would highly recommend a consultation with a board certified oral and maxillofacial surgeon who will do a complete work up. This will more than likely include a sleep study.  If the results of your exam, x-rays, and studies prove to be positive for obstructive sleep apnea,  then maxillary and mandibular advancement (jaw surgery),  A sliding genioplasty or chin implant, and possibly a soft palate procedure would be the treatment of choice.  I would highly caution you against a chin implant and neck lipossuction prior to a full work up for sleep apnea. If the sleep apnea work up is negative, and the jaws are determined to be in the proper position, then a sliding genioplasty or chin implant and liposuction  could satisfy the issues with the chin. Evaluation of snoring and possibly a minor soft palate procedure could also be indicated. Best of luck.   

The information you have presented is inadequate to provide any useful answer. At the least, you need to submit pictures of your face particularly from the profile view.

Dick Mulligan, great name for a golfer! See your local ENT MD for your snoring. When that is taken care of see several facial plastic specialists for you other concerns. Good luck!