Go to S&W's website and request a manual.
100-350 USD
Start by getting an owner's manual from the manufacturer, read it, and follow the instructions for cleaning and lubrication.
no
Follow instructions in the owner's manual. Contact the maker if you don't have one. If not in business, take it to your local gun smith.
What model, what condition, what year is the gun? You need to supply this information to get an answer.
Yes.
9mm means the firearm shoots a bullet that is about 9 millimeters wide.
Hoppe's #9 and a tootbrush
10-100 usd
Shotgun by far
You can from some, but they have to be designed to shoot both.
A 50 calibre machine gun can have any length or width. The inside of the barrel is 1/2 inch. Gradually calibre as a gun size is being dropped in favor of metric. For example 9 mm is replacing 38 calibre. A 38 calibre pistol will shoot a 9 mm bullet. Mortars are now 61 mm instead of a calibre.