Too many questions.
Nº point system. Nº on star.
It's going to cost you a fortune in tax to bring your car in and it's a 2 day process at best. Find a service that will do it for you.
Basic no fault Insurance is included in the registration fee.
Out of state plates are valid for 3 days.
The military absorbs all the cost of a vehicle shipment.
Unless things have changes in the last couple of years with PR-specific assignments, military members are allowed to keep their registration and drivers licenses of their home state. No problem at all keeping our AK plates in PR for 3 years - you'll just need to get an ACAA sticker. We are Alaska residents stationed in Virginia now, and are still allowed to maintain AK registry.
Again a sponsor is invaluable to explain all the nuances with military transfers to PR.