I would suggest that you seek out an agent in person too. There are numerous real estate office in Glenview and the surrounding areas. Generally stopping in is not a bad idea at all. You might be surprised at home many agents are sitting at their desk doing something useful!
I would do some preparations, by looking online and driving around the towns to get a sense for the kinds of houses that you can afford. Also you want to have a rough idea of the schools district boundaries, taxes, commuting and other things that good agents need to be on top of.
Ultimately you want to select an agent that is SMART about the things that matter to your AND you have a good report with so that they are NOT wasting your time / annoying you. It would be NICE if there is some way to 'preview' their negotiating skills, but that is long shot. What ought to be EASY for them to demonstrate is their COMMAND of the MLS system and how they can use it to quickly pull up comparable properties that have closed to bolster your position. If they are comfortable doing this with you at their desk odds are good they will do this equally well when facing a seller and their agent...
Finally it is always better to get an agent with a THOROUGH knowledge of the WIDE range of inventory. Generally this is a sign that they are a FULL TIME agent that sees LOTS of houses, either at agent open houses OR by assisting other buyers. You probably don't want an agent that is SO BUSY with other clients that you will not be a 'priority' but neither do you want an agent who is more surprised than you at the condition of a property.
By the way, a home is about 10x more than a car. How would feel if your only contact with a car salesperson was via email?
Good Luck!