I found these tutorials in Youtube that offer a step-by-step approach on how to better use your Zoom recorders. They were produced by www.proAudioDVDs.com. If you go to ProAudioDVD’s, their Youtube channel, and search for “H4n” you will find several other videos that deal with different issues, from mic set up to multitrack recording.
This video below shows you how to choose and set up a recording format, something you will need to know before you start recording interviews.