You can go to Baltimore and look for estate, land and court records, or hire a researcher to do so for you. One place to look for a possible researcher is the website of the Association of Professional Genealogists. The MD Historical Society or a local genealogical society may also have lists of available researchers.
Baltimore city and County land records have been posted on the internet at www.mdlandrec.net
. To utilize the site you must register (free) - they will send you a password.
Since your application must go through a particular existing DAR chapter, have you sought help from the person in such a chapter who is assigned to help applicants with their applications?