The typical medieval armorer was a high-end blacksmith. Since being an armorer was a skilled trade that required a lot of custom work, the prices fetched for armor enabled a much better lifestyle than that of a typical blacksmith, if the work was good enough.
Armorers would receive orders from nobility or knights, and custom make a suit of armor to fit that exact person. If the armor was damaged, the armorer would also repair it. Nobles and knights weren't the only people with armor, however, and the armorer would serve the lower classes as well, especially in times of war.
Polearms were a very common, although not all that glamorous, part of the middle ages. Even while the sword is seen as the classic weapon, polearms were ubiquitous due to their low cost and impressive effect. Many polearms look like farm implements at the end of a long pole - many were the actually just that! This made them the ideal weapon for a rapidly assembling an army - call the farmers and tell them to bring their pitchforks and pruning hooks!
http://talhoffer.blogspot.com/2009/05/what-is-pollaxe.html - great diagram
A mace was a short, club-like weapon that inflicted heavy damage by sheer force, not cutting ability. The blunt hit of a mace could injure a warrior in chain mail, while a sword might not penetrate the same armor. Also, a well-placed mace blow could crush plate armor, while a sword blow would often deflect off of the smooth surface.
A flanged mace was a type of mace that had short projections from the head called flanges. These flanges could concentrate the force of the blow into a much smaller area, making it possible to break armor where a normal mace could not.