Not required
Your local police can assist you with what is needed.
Depends on how the local and state laws are written.
It all depends on the country where you live. In the USA no registration is required. If you want to register it for the Warranty then go to the manufactures home page and register it there
No. As in most states, no registration of ordinary firearms is required.
Depends on the law of your state. It is not required under Federal law
There is no background check required for paintball guns.
First, find out if there is a process to register guns where you are. There is no gun registration in most of the US. If registration IS required, then check with the agency that handles that.
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.
Maine
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.
No. Like MOST states, it is not required. Link to a summary of Louisiana gun laws below.