http://www.pchristensen.com/blog/articles/how-to-learn-lisp/
First decide which lisp you're promoting , common lisp or scheme,
then adjust your guide accoding.
This way you're only confusing poeple. It's hard enough that common
lisp and scheme are not single implementation
language that presenting different langauges as one will make matters
even worse.
For starters with programming in general I highy Gentle intorduction
before PCL.
Slobodan