See if you can download the Medicaid requirements. My insurance company had a lot of very specific stipulations and requirements. I read those papers so many times, and it was good to have a hard copy. Don't try to lose right now - not before you know the plan's requirements. Some people have to actually gain a little to meet BMI requirements for surgery. Once you have information from the insurance, see how your PCP feels about working with WLS patients. Even if there is not a prolonged PCP supervision program required, you are going to need your PCP support and most likely letter of recommendation for the surgery. You can also start researching surgeons and then checking to see if they are approved by insurance. The insurance company can certainly give you names, but you may find others that may also be approved, but the insurance list is not up to date (not unusual). You want someone who not only does a good job and has been doing these procedures for years, but also a program that will follow you for years afterward. For example, my program has 2, 4, 6, 8-9, 9-12, 18 month followups, with yearly followups for 5 years. You will need that support and supervision.
Absolutely start going to free seminars that many programs offer. Even if not approved by your insurance, it will give you a lot of information and ideas of what will happen. It is a good place to start your education. Just remember that they are selling a product. Keep that in mind. Focus on facts and not the sales pitch.
You can also start watching YouTube programs. Dr. Matthew Weiner has a ton of good information - all the way from choosing the right surgery and how surgery works, to long term maintenance. Bear in mind, his post op diet will probably be different from your own surgeon's (MW starts soft veggies very early on, while mine made me wait 8 weeks). But he does have a LOT of good information that is sound and will give you a good foundation. You want to go into this armed with all the information and education you can get. It's very sad when someone has surgery and then says, "I didn't know about such and such" or "why didn't they tell me this or that." You have to take responsibility for your own education on this - no excuse for ignorance with all the good info out there.
So there are some ideas. It is a lifelong journey, not a sprint. It's great you are in a place where you are really ready to make the changes at such a young age - before you get all the degenerative breakdown and health issues that many of us have from decade upon decade of obesity. Keep us posted on your progress.