Congrats yellowhawk! Sounds like a good deal to me. Don't worry about flying off of grass. Thats probably what most people fly off of. I fly mostly off of a paved runway and I can tell you that grass is easier. Plus, your covering won't get ripped when you have a less than perfect landing.
Its good that you are going to use an instructor, and have the experience of 15 others to learn from-
Best of luck to you
Jason