A cheap $25 bucks if you consider the lifetime of the pole horse. 19sec Pole Bending Book - The Tack Stop
Great book. I have one at home too. Which reminds me I should refresh my memory and take a glance through it again.
Same thing the other two have said. Your horse should already know how to side pass and already know (at least) how to do simple lead changes. Between each pole, really exaggerate and side pass the horse in-between weaves.
This short video clip shows a good pattern to follow. I personally will exagerate the side passing even more, going through the middle.
I also want to mention that you always need to tip the horse's nose toward
the pole when you are asking for bend around the pole in the weave, using your inside (pole) leg to create the bend. NEVER try to pull your horse's head away from the pole, because if you add speed and do that, they will shoulder into the pole and knock it.
In general, I try to keep my hands off as much as I can, and use lots of leg to cue them through the weaves and, eventually, through flying lead changes through the poles.