no
No.
do you need to register a 50cc scooter in Colorado
No
Be of legal age and not be legally disqualified from purchasing a firearm.
No
Depends on where you are. In MOST of the US, there is no requirement to register an ordinary firearm. There is also no place to register a gun- on line or otherwise.
Go to your local police station.
Depends on where you are. In most of the US, there IS no registration of firearms.
Not to own a gun. Only to carry it concealed.
Wisconsin does not require registration of regular Title I firearms.
To register a new business in Colorado you need to fill out certain forms and hand them in. The easiest way is to use the Colorado Business Express service available at Colorado dot gov. It has easy step-by-step instructions.
You would have to go to your local gun shop and register your firearm there. Then, after completing that, you would have to go the gun range and register yourself there, with your gun permit.