First off, your commute into DC is going to SUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUCK.
Bringing guns into MD:
SBRs, SBSs, cans, AOWs, DDs - no problem
MGs - no problem other than an additional registration with the state
non-assaulty rifles and/or shotguns - no problem
assaulty-type things - will be problem if they are enumerated on the ban list, otherwise,
maybe register with the state police depending on configuration (pistol, receiver only) (
https://mdsp.maryland.gov/Organizat...LicensingDivision/Firearms/FirearmSearch.aspx)
handguns - must have a handgun qualification license (
https://mdsp.maryland.gov/Organizat...ion/Firearms/HandgunQualificationLicense.aspx) then register with the state, handgun must be approved for sale (
https://mdsp.maryland.gov/Organization/Handgun Roster Meeting Minutes/Disapproved List.pdf)
(
https://licensingportal.mdsp.maryland.gov/MspBridgeClient/#/home)
Snow - hit or miss, can go years with no snow and then get 2 ft.; wouldn't be a bad idea to have a snowblower if you've got a long driveway or are essential personnel but it may sit idle for the whole time you're here (Western and Southern MD usually gets hit harder than the northern region).
Fuel oil - winters have been mild (night-time high 20s-low 30's), summers are swampy, though.
Ranges - Delmarva (23501 Marsh Rd, Mardela Springs, MD 21837) would be the big one (500 yds.) but they're on the other side of the bay so you've got to go north to 50 and then follow it south; St. Charles Sportsman Club would be closer but they are private membership (and I think that their facilities are closed for the moment); there is/was a public lands shithole near Waldorf but that shithole is/was only about 80 yds., and it's a shithole.
Some 25-50 yd. indoor ranges nearby but nothing of note, oh, other than Maryland Small Arms - avoid Maryland Small Arms unless you want to be followed home by some DC wannabe thugs and targeted for burglary.
Wish I had better news for ya.