I've recently been in the same position. My strategy going in was to make something happen. What I forgot was the patience and consistency to wait for the right opportunity.
I would say be prepared to rally against balls that are not going to be comfortable, they will be deep and penetrating at that level. But also be prepared to change into an aggresive position if you get the chance. Take the opportunities given you and go for it, or set something up. They will come, but not often.
Hope this helps.
BTW - I lost. But I really feel that it would have been a better score line if I had played a little more consistently instead of feeling I had to hit a great shot. I didn't get blown off the court, which gives me some encouragement for the next time!
Good luck, and don't forget to have fun. These are great chances to feel a little different kind of tennis.