I did this last night just with combining a couple chords and recording them in Garageband, then I found a "modern rock" drum loop that seemed to fit and re-recorded the chords against the track. Also after recording the couple chords for several measures, I shifted to a couple other chords that might serve as a bridge or chorus or something. Who knows? Nothing much, but at least I recorded a start that I can mess with.

At Spud's suggestion, i am going to import this or record this much into my looper pedal so I can mess with it there.