Hey Wayne , For the set up I recommend you follow this procedure.
http://www.rcuniverse.com/forum/elec...ints-jeti.html
By Jim Odino ( OhD) In my opinion he is pretty much the master of these things .
To set the pulse width all you do is plug the wire that came with it into the receiver THR slot and into the blue slot on the box . Turn the transmitter and receiver on and the box will come on it does not need to be hooked to the ESC or to a battery to set your pulse width from your transmitter. Make sure every thing else like THR curve, or anything you may have mixed or programed on or with the THR be zeroed out before you set them with your ATV
Once you set them you wont have to touch them again.
Follow the rest of Jim's set up for your motor . It seems a little much at first but once you go through it a time or two it is really easy and the ESC is very programmable and friendly.
Jim has written about this many times some in more depth you can click on OhD and find them.