Can you make a factory key from the Vin number if I go to the dealer, I lost my key

Depends on the car, usually the key will need to be programed to the vehicle in order for it to start the vehicle. Generally you want the car towed in for that... And that way you know the key works too.

Dealership can help

Yes you can

Yes.

I am sure you can make it at the dealer but they may charge