Most people learn this tune Scruggs style first. That's ok, but you could also start here, and it's always good to branch out and try new things. Learning this tune in the single string style familiarizes you more with the core melody notes and can give you some great lick ideas to incorporate with your Scruggs style playing. Get the basics down and pay close attention to the pick hand fingerings in the tab. Notice how changes in the melody correspond to chord changes. Making this connection is a good exercise for your ears
After getting comfortable with the core arrangement, try out some of those licks! There's some great single string ideas and some classic Scruggs licks to mix in.