As I'm not able to edit my leading post right now, I'll make my updates here:
Maryland Law Section 4-203 will answer most questions regarding carrying handguns.
Unless you are a police office, you basically must have a death threat against you.
Inside The Home Ownership:
According to MD Law 4-203(b)(6), Maryland law does not prohibit:
On Your Property Ownership/Carrying
(6) the wearing, carrying, or transporting of a handgun by a person on real estate that the person owns or leases or where the person resides or within the confines of a business establishment that the person owns or leases;
(i.e. carrying a gun outside for a smoke/cig, mowing your lawn, etc.):
See above (Section 4-203(b)(6)).
Carrying in your vehicle:
Again MD law 4-203(b) has your answers.
For carrying to/from purchase, gunsmith, business/residence(s), it is not prohibited:
(3) the carrying of a handgun on the person or in a vehicle while the person is transporting the handgun to or from the place of legal purchase or sale, or to or from a bona fide repair shop, or between bona fide residences of the person, or between the bona fide residence and place of business of the person, if the business is operated and owned substantially by the person if each handgun is unloaded and carried in an enclosed case or an enclosed holster;
For carrying to/from the firing range, it is not prohibited:
(4) the wearing, carrying, or transporting by a person of a handgun used in connection with an organized military activity, a target shoot, formal or informal target practice, sport shooting event, hunting, a Department of Natural Resources-sponsored firearms and hunter safety class, trapping, or a dog obedience training class or show, while the person is engaged in, on the way to, or returning from that activity if each handgun is unloaded and carried in an enclosed case or an enclosed holster;
Just make sure it is unloaded and in an enclosed case.
Note: This information is for reference only. For legal reference, contact the proper authorities.
I'm still looking in the definition of 'enclosed case' but I've answered most of my questions. I'm going to try to keep this update as I dive further into gun ownership in MD.