Congratulations! I went with a doctor who a friend had used (Dr. Rumbaut in Monterrey -- I was self-pay) and who had very good reviews on this site and an incredible amount of experience.
One book that I really found helpful before I had my surgery was this one --
Amazon.com: Weight Loss Surgery with the Adjustable Gastric Band: Everything You Need to Know Before and After Surgery to Lose Weight Successfully (9781600940026): Robert Sewell M.D., Linda Rohrbough: Books -- if you're looking for a good guide on what to expect, mentally and physically, I found this to be a great resource.
I hope it goes well with your Dr!
Catherine