The first place to start is listening to Bluegrass, so here are some of my suggestions.
Bill Monreo - his is considered the farther of Bluegrass and rightfully so.
Flatt and Scuggs- both played with Bill Monreo and became commercially successful with The Beverly Hillbillies theme . Also Earl Scuggs is the pioneering banjo player the created the bluegrass banjo sound .
The Stanley Brothers - They play in a Bluegrass style but kept move traditional mountain music in there sound.
To me this is the foundation of the music, while there are many greats, you will find that being familiar with there music you will know many jam standards and you will also learn the basic structure of the Blugrass style.
Most important go to Blugrass jams, I'm sure there are some in your area.
Ok now I'll answer your question ! Lol! Sorry.
Some very easy songs are:
Will the circle be unbroken
Mama don't allow
Siting on top of the world
This is just a few.
Here is a web site that has some tabs. http://www.bluegrasscollege.org:8080...r=GotoTab&id=5
There are some good books that will get you going in the right direction also.
Hope this helps some.