There are several great web sites that have animated pictures of knots, and great printable pictures that can help you along. Do a search for "knot knowledge", that is one of the good sites I can recall, and I have also seen some great boy scout web pages with knots. "On Rope" book is a huge resouce for knots, also get the tree climbers companion. Check out:
-Blakes hitch ---great ascending knot
-French Prussic ---great ascending knot
-Timber hitch ---EASY to tie very secure anchor
-Timber with half hitch ---good for lowering sections of large wood
-Bowline -----MUST KNOW this knot, you will use it all the time
-Running Bowline ---- MUST KNOW
-Munter --- good for descending with just a biner
Spike it, living where you do I'm suprised that you don't get thrown in jail for triming with spikes. Try ropes, you'll eventually get good enough where the rope will be much faster. It is also a great way for you to stand out from your competition.
Greg