If I recall correctly you can create custom fields in CS and also make them required fields (in addition to the area of expertise), so that an instruction such as "Please search by zip code, city and/or state" above the form would get you the intended user list.
Yes, you create custom fields in CB. Most of your questions are in regards to basic core CB which is entirely free and I highly suggest you simply give it a try. Even our demo site provides full access to frontend and backend allowing you to tinker with it however you like.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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-- If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
-- If I've missed your support post with a delay of 3 days or greater and are a Professional, Developer, or CBSubs subscriber please
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-- My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.