I'm going to take exceptions to a few comments.
First, for the lesson, since you cross country, take a private. In a group beginner lesson, the instructor will most likely not be able to compensate for your more advanced knowledge. In my experience, a student/customer that has experience with some type of snow skiing is much more experienced than the typical beginner. In a private lesson (for someone that has been on snow and some type of skis), you can expect to make much more progress than would be typical in a "learn to ski" group lesson. JUST LET YOUR COACH KNOW ABOUT THE CROSS COUNTRY EXPERIENCE.
Secondly, rentals. While you will get better value and fit from a shop outside the resort confines, if any fit changes (if is NOT unusual for the bindings to shift before/during/after skiing), the resort shop and/or employees will not be allowed to readjust them due to liability concerns. If you rent equipment at the resort, and something is wrong, it is much easier to get it fixed within the time you are actually skiing.
Most important, have fun!!