The best way to get started working with loops is to just jump in and insert a few grooves. Think of this as the initial jam session when you start to kick around song ideas at the rehearsal space. Focus on getting the basic song structure in place with each section typically being 4, 8, or 16 bars in length. Don't worry about any of the fills or breaks.
After you have your basic drum track in place record some of your other tracks.
Then, after you record your other tracks, go back and place in all your fills, breaks, hits, and cymbal crashes to make your drum track come alive and sound more realistic.