Hello Mark,
in the Beginner's thread:
http://www.irealb.com/forums/showthr...=7078#post7078
are some links to the popular playlists downloaded, and you will see many more as well as individual songs if you run a Search (top right).
For any songs you do not need, just delete them after import, or download individual songs as needed.
And yes, for songs not found here, you can create your own (and perhaps upload them here for others to use).

There is no melody notation staff and little space for lyrics within the app currently, but I presume you sing or have singers when you play your Ukulele.
If you want to view a PDF with lyrics, notation etc. while iReal Pro is playing the backing, check out this thread:
http://www.irealb.com/forums/showthr...g-using-Player

I hope this helps.