Well 12 total actually per gun season.
10 antlerless and 2 antlered per rifle and shotgun. And 10 antlerless and 2 antlered for muzzleloader. Thats a total of 24 allowed each year just for those 2 seasons. Their are also limits for bow which are different than for gun. You are right about haveing to kill 2 antlerless before taking 2nd antlered.You also will need a bounus antlered stamp before killing 2nd antlered deer.
You will need to take a hunter education course before purchaseing a Hunting license in Maryland. You cannot get a hunting license without it unless youAlready had a Hunting license before1977. I think thats the right date.