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Here's a close up of the drive pulley.  The size will depend on the speed of your motor, and how fast you want to go.  Our motor can be electronically adjusted for minimum and maximum rpm, and is variable speed.  We have an 8" diameter pulley and have adjusted the motor for a lure coursing standard top speed of 55mph.  We had the advantage of having a special gauge to read rpm.  If you don't, or you are using the more common drive method of a Ford starter motor, you'll just have to wing it.  As long as you can keep the lure in the correction position, you'll be ok.

Here's a view of the back of the machine.  As you can see it's just a very simple frame.  It does need to be strong enough to resist the line tension.

The pulleys on the ground are a low profile and a hold-down pulley from Injoy.  The string was being strung out as I was taking the pictures.  It's just tied off to keep it under control.  You will want to set up a spool of some kind that can be turned by your motor.  It's a lot of string to wind up by hand.