Welcome to friendly Carroll County. Sounds like you have the answers you need regarding the firearms.
Regarding your commute: My wife and I moved to Carroll about 20 years ago with the same situation - wife in Baltimore and me in DC (we came from Ohio). She drove to Owings Mills for the train, and I drove into DC. Now she goes to Ft Meade for work and I take the MARC from Savage.
If you can swing the MARC train, it makes commuting much easier depending on where you work in DC. If metro (subway) becomes a big part of it then all bets are off. Metro sucks. What part of DC are you working in? Do you need your vehicle?
Regarding your commute: My wife and I moved to Carroll about 20 years ago with the same situation - wife in Baltimore and me in DC (we came from Ohio). She drove to Owings Mills for the train, and I drove into DC. Now she goes to Ft Meade for work and I take the MARC from Savage.
If you can swing the MARC train, it makes commuting much easier depending on where you work in DC. If metro (subway) becomes a big part of it then all bets are off. Metro sucks. What part of DC are you working in? Do you need your vehicle?