[header] How to lead nature walks [title] Read up about the local plants and animals that live in your area. [step] Field guides are a good introduction to acquiring this skill set. So is tapping the wisdom of long-time naturalists who might live nearby. 
[title] Take a hike through the area beforehand and note any unusual features about the area. [step] Are there nests to observe or evidence of animal activity (beaver damage to trees along a riverbank for example)? [title] On the day of the tour, gather your group and assess their physical limitations if any.