Doing different things on different days is good. And whatever you do, sweat buckets. If you're not wet, you're not working hard enough. You should be breathing deeply, sometimes slowly, sometimes quickly. Don't sit there and read. If you can read, you're not going hard enough to do anything. You might find that 60 minutes is kind of a long time to go that hard. If so, ride a little less and work up to riding that full hour. But you can probably do it just fine now. Listening to music is good. The pretty folks who sit there and read magazines are not your role model. You won't see them out on the road.
Try to ride about 90 rpm (cadence). Don't worry about heart rate yet.