2) After every time you shoot it (At least clean the barrel every time you shoot any gun; the action should be cleaned nearly every time also if you like a well functioning smooth action)
3) At least once a month if not shot (Contrary to popular belief, guns will decay if left in a closet, truck, safe, etc for extended periods of time. The cleaning won't need to be as thorough as if you actually shot it, but you will want to at least lightly clean it and lubricate it with good gun oil/protectant (I use Breakfree CLP on everything)