I’ve set up an Advent board with some (not an exhaustive, but some) resources for Advent. If you know of any good ones, leave them in the comments and I’ll add them to the board!
http://www.pinterest.com/kathleenmbasi/joy-to-the-world-advent-activities-for-your-family/
Kathleen M. Basi 
We don’t have a Jesse tree this year but this book looks like it would be really good for getting started