RE: Getting Back in
AMA is a definite YES !!! for insurance and it gets you into events.
6 Channel radio YES !!! a computer type Of course.
Since you where flying a stick when left the hobby You can now get an ARF version of the same plane. Great Planes has a decent one. You can get an Ultra Stick after you've retuned your skills.
As far as the landing strip, you'll need to pick your area and smooth and level it out. Then plant your favorite grass. And keep it mowed. Or join a nearby club. Another reason for AMA
Good luck and have fun!!![&:]