Watch the Week 1: Wabash Cannonball online guitar lesson by Roberto Dalla Vecchia from Flat Out Flatpicking
After practicing all those strumming variations, it's time to include them in your back up playing. Here's my backing part for "Wabash Cannonball", I used several of the ideas you've already studied. My arrangement wants to be just an example of what you can do. Learn it but don't stop here, go on and make up your own arrangements!