Just the melody. If you are weary from learning and practicing rolls, leaning a melody is a great thing to work on. In fact, Sonny Osbourne has said that is how all banjo players should start out. Almost every measure in this arrangement has options in the lick switcher. So after you've got the melody. You've got a lot of options to add in licks. Check them out one at a time, or shuffle them to completely transform the arrangement.
Practice until it's easy, don't strive for just getting through it once, strive to be able to play multiple times through with good timing and minimal mistakes. After you get confident in the melody you can try a few licks. Those will show you how you can incorporate rolls, walks and some fret hand embellishments. Scruggs #2 licks will be slightly more difficult. Learning one or two of these will help prepare you for the Scruggs style arrangement.