redrider - once you've got the hang of Les' lesson there's a bit more on bluegrass here:
http://www.guitarforbeginners.com/fo...grass-lick%5D/
You might also look at solidwalnut's rhythm lessons beginning here:
Much Ado About Rhythm: Part 1 [Beginner & Intermediate/All Styles/Technique]
Good luck with it and have fun.