Geoff,
I'm no expert, though I am an enthusiastic student... so take what I say as you will. Not being sure of the site, your resources or your time availability, I'll throw out some generic advice.
At this early stage, developing a solid design is key, whether you do it yourself, or hire it out to a designer. And the first step in design is site analysis, the better you know the site the better you can plan and design. It's better to start slow and methodically then to realize some years and many dollars down the road that you've put things in all the wrong places.
As for remediation steps while you aren't on the land full time... You could plant trees for a future food forest, but again this should be done after a solid site design is completed. What you can do to improve the land, and it won't create permanent plantings, is some keyline plowing followed by seeding tillage and soil building cover crops. Add to this regime some yearly or twice yearly mowing, and I think after a few years, your soil would be markedly improved.
Here's some elaboration of my ideas. Keyline plowing is a technique that opens up subsoil channels, just off contour, allowing increased water infiltration. It also lifts the soil structure, without causing too much soil damage, unlike traditional plowing styles. Further resources on keyline can be found through Darren Doherty. There's also a fellow based in Arkansas, the Keyline Cowboy, who might be able to help (my US geography is hazy, in respect to distances between OH and AR).
Seeding the land with nitrogen fixing cover crops (clovers and the like) as well as tillage radishes (big Daikon and other similar radishes) will help improve soil. The nitrogen fixers add nitrogen, while the tillage radishes penetrate down into the soil, and if you allow the radishes to die off, they rot in the soil leaving lots of organic matter to be distributed by the soil critters. Add occasional mowing to this regime as follows...
Occasional mowing (once or twice a year) is thought to mimic roaming herds of wild herbivores. Allowing field plants to grow up, and then cutting them back, causes large levels of
root die-off. These
roots then break down in the soil, creating space and adding organic matter. Much like the tillage radishes, but in a more filamentous manner. This is even better for the soil if you flail mow, which mulches the cut material for faster decomposition back into the soil. You could find more on this idea from
Alan Savory,
Joel Salatin and other rotational paddock system proponents. Of
course they recommend using grazing animals, but mowing is a possible second option as well.
I'm not sure how much work you want to do or pay others to do, nor your access to agricultural machinery, but I imagine much of the above could be contracted out, from the West Coast, if you found someone you could trust.
Anyhow, some large scale ideas for soil building. And I agree with Mike, doing nothing is a great way to end up with nothing but scrub bush in a few years, which will be a pain to clear. Check out
Ben Falk's advice on 'leaving nature to take it's course" (his recent book "The Resilient Farm and Homestead" is brilliant). And contrary to popular belief, forested land usually has poorer soil, much of the nutrients are in the trees, not the soil. Grasslands are where the rich soils live. And Mike's other point, about spreading rock dust, is worth investigating, much of our soils are unbalanced, and lack a full nutrient profile. Re-mineralizing soils can be pretty important. Steve Solomon's latest book "The Intelligent Gardener" is worth a read in regards to soil balance and minerals.
Good luck!