Inherited Martin Guitar

I just inherited a Shenandoah D-3532 from my grandfather who recently passed. I know that it has had some custom neck work done to make fretting easier and there was a proper setup job done at some point.

I know it isn't one of the top of the line models but it means a lot to me. I really like the tone and I want to keep the worn look. I know it has not been played in YEARS. The tuners have a little bit of corrosion on them and the frets are a little green from corrosion as well. Other than replacing the strings what should I do to condition/clean up/restore it?

Guitar is not my first instrument but I'd like to get better at it.