Here is the link to the LbNA FAQ page.

http://letterboxing.org/faq.html

Regarding easy/difficult clues, you can separate your description into
two segments: The hike itself ("easy" would be level, no climbing, not a
long walk -- you could give a description of the type of terrain) and the
clues ("easy" would be straightforward directions to the box, nothing cryptic).

Ruthann
aka Mirkwood