Yes, even for that size aircraft.
Yes.
Yes, you need a license to fly any plane in any state in the US. California is no exception. You can find in-depth information at www.californiaaviation.com
You buy it or build it. No different than owning a car. You DO need a license to FLY it.
No, that's a whole different licensing and certification system.
A bush plane is the nickname given to small planes that fly in remote areas. Though, they do in some cases carry passengers to these remote locations.
Yes - you need to demonstrate your capability to fly even light aircraft such as a gyroplane through successful completion of the relevant exams.
A pilot of a plane needs the same license to fly a cargo plane as a pilot of a passenger plane.
get in a small plane with a flight instructor, let him teach you to fly it and then eventually get your private pilots license
Bush flied in a S-3B Viking.
Not if you're using it as the authority to pilot the plane.
A plane with floats is a "floatplane" or a "seaplane." A plane with skis is a "skiplane." Check it out: you need a special license to fly a seaplane! If you have a single-engine Piper and land it at airports, the minimum license is ASEL--airplane, single engine, land. You could also fly it with an AMEL--airplane, multiengine, land. But to fly a seaplane you need an ASES or AMES--airplane, single engine, sea or airplane, multiengine, sea.
Sure.It's like with cars, you don't have to have the license to be able to use them, but it's a real good idea.