Congrats on taking the first steps to a healthier you!
One of your first decisions to make is which surgery. Please don't do the lap band. Just cross that one off your list right away. The Roux-en-Y bypass (RNY, or simply bypass), the Vertical Sleeve Gastrectomy (sleeve), or Duodenal Switch (DS).
You might qualify for any of the three, your surgeon will likely point you in a direction based on your circumstances or his own expertise (be careful of the latter, because you want the right surgery for YOU, not just what he's selling). There are tons of threads on the board about how to choose a procedure. Look around, and have fun during the research phase. You don't have to make a decision right away either. (But you might as well start looking early so you have time to really get comfortable with the idea of whichever you choose).
All three have similar post-op diets and recovery phases. The main differences are the long-term complications, statistics, and vitamin requirements. (The DS also has higher goals for protein and fat intakes.)
Good luck!