JEllis, When mine were delivered the dealer called me and I saw it before they unwrapped it. I has plastic coverings and they do a complete checklist for preparation. The warranty is the same exact as if you've bought it in the States. Registration at the DMV is slightly different since the title will list you as the "distributor" They may inspect it to make sure it is U.S. spec. Don't worry. It is.
You will pay the registration and California use tax directly to the DMV.
If you can register it in a state with no sales tax then do so. Sometimes as military you can use your home of record.