Here are some great articles I found on training your horse up to a trail course.
About the trail course and how to set up the obstacles
http://www.horsechannel.com/western-horse-training/trail-practice-course.aspx
Teaching your horse how to focus on the pole
http://www.equisearch.com/horses_riding_training/western/pattern_events/eqpolepwr555/
Crossed pole exrcises
http://www.equisearch.com/horses_riding_training/western/pattern_events/eqpole1037/
Have a good time out there!
