Ask a landlord-tenant lawyer and get answers ASAP
While lawyers typically charge by the hour, there are attorneys who will represent a tenant in a forcible for a flat fee. It is completely negotiable. If you use a neighborhood attorney you will find it less expensive.
I would expect it to run at least $500.
If you need assistance finding local counsel try Martindale Hubble. Many attorneys themselves use this site to locate attorneys outside their jurisdiction or expertise:
http://www.martindale.com/Find-Lawyers-and-Law-Firms.aspxIt is a huge worldwide database searchable by location and specialty.