You might start with The Best There Ever Was (Yazoo) - http://www.amazon.com/Best-There-Ever-Was-Legendary/dp/B0000AGWIQ/ref=sr_1_1?s=music&ie=UTF8&qid=1404605370&sr=1-1&keywords=the+best+there+ever+was
It's an excellent compilation of acoustic blues from the 1920s and 30s, and it will give you a good taste of a number of performers and styles. If you hear music you like, you can move on from there.
If you're looking for more recent recordings, Mississippi John Hurt: Today! (Vanguard) - http://www.amazon.com/Today-Mississippi-John-Hurt/dp/B000000EJ2/ref=sr_1_5?s=music&ie=UTF8&qid=1404605700&sr=1-5&keywords=mississippi+john+hurt is worth checking out. I can't imagine that too many people wouldn't enjoy it.
And a more recent recording, Etta Baker: One -Dime Blues (Rounder) http://www.amazon.com/One-Dime-Blues-Etta-Baker/dp/B0000002ZG/ref=sr_1_1?ie=UTF8&qid=1404605950&sr=8-1&keywords=etta+baker+one-dime+blues has some very finger-picked guitar. This one is mostly instrumental.
This is a very, very small sampling of the music that's available. But it might be a start that leads you to new musical discoveries in your life.