Yes,no,yes,no,yes,no.
Oregon plates are two years. The only permanent plates are disabled vets. License fees based on vehicle age. You will need a permanent address to register and title in Oregon. If you live here, move here permanently. In Oregon, as long as your outside the DMV smog check areas licenze can be renewed by mail.
As with most all states, licensing and registration information can be found online. Might be worth your time to research it online.