If you're just getting started with ruler work, I highly recommend the Craftsy class taught by Kimmy Bruner. I finished it recently and felt that it was worth the time and money. Also, yesterday there was a webinar on rulers by HandiQuilter, and they're supposed to have it up on their web site by Monday 12/17. Their rulers are appropriate for any machine that uses the 1/4" rulers, not just the HandiQuilter. The webinar doesn't really teach you to use the rulers, but it does give a good introduction to their rulers and how they might be used and at the very end they address what rulers a new longarmer might want to buy at first (one for lines and one for curves).
Also, I found some useful information regarding what thickness of rulers to use here:
http://www.thegadgetgirls.com/longar...formation.html I have an Innova and have had no problem using 1/4" rulers with my hopping foot. Looking at the Baileys site, it appears that they have a separate "ruler foot" that you would need to use for ruler work.