Yes, if you have a concealed hand guns permit with you at all times. The ammunition can not be in the weapon or stored in the same place in the vehicle as the hand gun, however it may be in the clip or magazine of the weapon as long as they are not stored around eachother. So basically, you can have a concealed hand gun in your vehicle as long as you always have your permit for the weapon and it is not loaded.
The answer depends on the context. Usually a "gun permit" means a permit to carry a concealed handgun on your person. Some states (CA I think?) require a registration process in order to purchase a handgun which is sometimes referred to as a "permit". Conceal permits are regulated by state and laws very as many different states we have.
I don't know about California, but in most states there is no official gun registration. You can carry a handgun in California if you have a California handgun permit, but I understand those are hard to obtain in some counties.
In California? Be well-connected.
You can if you want an encounter with police, criminals, etc..
You can, but, you better have lawyer on speed dial (even if you are legal to do so)
As long as you do not have it loaded and have it in your trunk in a container, you can transport it anywhere.
No it is not legal. NV only recognized permits from a few states, and CA is not one of them. For more information, see the associated link.
the minimum age to obtain a drivers permit in CA is 15 and 1/2 years old
There is no charge for a sellers permit in California. All that is required is an application for a permit.
at a BMV
Not a good idea. First, you have to ensure the firearm is legal in California - major difference in state firearms laws between AZ and CA. Second, you need to keep it locked away and unloaded in California, as they do not reciprocate concealed carry permits.