I'd suggest you make some notes to take with you. Don't depend on your memory at the time of the appt. Also write down any questions you want to ask.
Many of us have left a Dr's office and then said, "Oh yeah, what I really wanted to talk about was ......."
Maybe make up a time line of your symptoms. You could ask him what a typical course of treatment would be, but we're all different in the way we respond/ tolerate meds.
I'd expect him to give you a Lyme and treatment overview. Just ask questions as you go. Take notes that you can refer to later.