Depending on your present skills, you might want to run through Fundamentals 1 and 2.
Bluegrass study can be found at the "Lesson". Most are advanced skills
Make yourself a study guide broke down in sections.
Example
1 Warm up techniques
2 New skills
3 New song
4 Free time for noodling, taking notes, and learn the GT website
Being of short attention span you can set sections time to what is mentally comfortable to you..
Don't forget to hobnob with like minded guitarist (musicians).