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You will have to state whether it is a rifle or handgun to get an answer.
No.
Only NFA regulated items. For a typical rifle or shotgun, no.
You will need to define assault rifle, and where you live. A TRUE assault rifle is a machine gun, and transfers of them are tightly regulated by the Federal government. What most people CALL an assault rifle is nothing but a semi-automatic rifle, and in most of the US, does not require a license to possess.
You don't need a gun license if you are 25 but if your under 25 you do need a gun license
You never need a license to have an Airsoft gun.
To get a gun license you would need to go into a gun store in the town you live in and ask for the information you need.
no, if your gun is below the legal muzzle velocity which is 12 ft/p/lb [12 feet per pound of force]
yes
No.
It depends on several factors; Where you are located and exactly what you mean by "gun license." Do you mean a license to carry a gun? A license to purchase a gun? A license to build guns?
Diameter of either the cartridge or the bore, dependent on how the measurements are taken.