Hi fallinggirl! I hope your appointment is helpful.
Hopefully the neurologist has already seen your MRI images. If not you might be told to come back after they've been reviewed, or you might get lucky and have them reviewed while you're there.
You should get basic muscle and reflex exams. This involves push/pull testing on your extremities, poking with mildly sharp instruments and tuning forks, and thumbnails run up against what should be very uncomfortable areas (the bottom of your foot is the one I remember the most). You should be asked to walk in hopefully a longer distance than the area of the tiny exam room. Walking 3 steps then turning around, IMO (In My Opinion) just isn't far enough.
You should be asked about any incidents that may have occurred in times previous. Tell the neurologist about things that seem inconsequential to you. Stuff like a numb spot you couldn't figure out, some weird visual disturbance, your leg swinging out when you walked, even something as simple as confusion about words or memory.
If a neurologist suspects MS, s/he might call for further tests. Some neuros don't diagnose by MRI alone. Further testing might involve a lumbar puncture (spinal tap), or Evoked Potentials. There are other more involved tests that aren't as common.
I was diagnosed by MRI and reported past vague symptoms, over 12 years ago. I hope things go smoothly for you you, fallinggirl! Maybe you don't have MS. But if you do, this is a great website to learn from!