So you have not yet had an EMG? Even if they say they have sent all your paperwork get copies to take with you of all tests preferably get a disc of any mris. Get consult notes too from ortho and neuro. That is the biggest thing so they have all the data. Otherwise when I go to a new doctor I bring a summary of my medical history. It speeds things up include your meds, allergies, current medical problems like diabetes blood pressure etc if any, significant past illnesses, surgical history, so called social history ( tobacco, alcohol,recreational drugs if you are comfortable putting on paper, marital status, children,occupation) family history ( if you do not have significant neurological family history this can be very brief. If you do have big neurological issues there they will want to know age of onset and at death if they have passed). They would ask all of this and you do not have to do it but it speeds things up and ensures you do not forget.
Think about how you will explain your symptoms important things are usually timing of onset and what you can't do. My leg is weak is vague something like I can't climb stairs with that leg or it collapses ( be prepared to show how. When I started symptoms I was able to demonstrate how my ankle gave out and the EMG doctor immediately identified the problem muscle) so be specific as possible. Hope this helps