Welcome Nick!
That's an exciting opportunity. Considering the long scope you're looking at I'd say its totally feasible to do some productive work. Given the time frame you have I would personally start with observational "camping" trips out there. Walk around, explore, sleep in different parts of the property, try to catch different weather systems, etc...
From those trips (could spend a whole year doing that to really see what a cycle looks like and you could add in road/path construction and maintenance, basic brush clearing, etc..) I would make a plan for the whole property and then move on to
earthworks. Could be sealed,
hugelkultur mounds, terraces, stone walls, ponds, etc... Lots of those projects could be accomplished or advanced with a concerted 2 or 3 day effort. If you had extensive earth shaping goals and did it all by hand that could occupy another couple of years.
Then I would move on to trees and
perennial shrubs and such. Any structure creation you wanted to do too. With a timeline of a decade or two and a dozen or two work sessions a year, you could definitely build a paradise to move to.
Good luck and please keep us updated if you do embark on the journey