My starter kit from Westalee came with the Ruler Foot, an Arc Ruler (arc on one side & straight on the other), a spacing gauge and a strip of stable tape. The stable tape is to stick to the back side of the ruler to keep it from slipping. Since I haven't used my ruler much yet, I don't know how well it really works but I did attach it to the back of my ruler.

I really have fun doing ruler work. I also bought the Westalee starter set. It really depends on what designs that you want to do. Honestly, I haven't really quilted with all of them. I have purchased some other rulers, too and they are good. It depends on what designs that you want to quilt. It's like piecing if you enjoy some designs vs others then that's the direction that you go in. Ruler work is great. It takes a little while to get the hang of it IMHO. I have a Brother PQ 1500s that I enjoy & they play nicely with that. I have the Westalee as well as the clarity foot which came out later. I prefer the clarity foot since you can see where you are going & where to stop. Be sure to use your ruler to practice & to sketch on paper with it. That helps so that you can know where to go next.
HTH
Min

Msews I also have the brother pq1500s but found I had to add another thread quide to work with a ruler foot. I also found the Juki foot which is spring loaded so you can adjust the pressure on the foot works much better than the clarity or westelee the spring helps to go over seams much better and I have less skipped stitches. The extra thread guide allows me to move in pretty much any direction. I have found the Judi Madsen ruler with the angled handle works the best for me for a small straight ruler. The angle seems to make it easy to use in any direction

Thank you everyone, for your helpful comments and suggestions. You have helped me make my decision. Although I would love to try the Westalee starter set, I think I will go with Angela Walter's "Shorty" and "Archie" to start. Once I feel confident with those two, I will be placing my order for the Westalee starter set. So many possibities - so little time! I think I will have to live to be 213 years to get everything done that I would like to. Once again, thank you for your input.

Sailorwoman, I just want to add something here.
I'm famous for buying all kinds of things and then not devoting enough time to practice. Then when the time comes to use my new skills I panic! :D
So my resolution for next year is to practice with rulers and FMQ to get better at it! :)

I was not able to post yesterday, hence the empty message box. However, I hope that we can continue this thread in a few months to learn from others what has worked for them and what hasn't as we learn this technique of ruler work. I am sure we will have some humourous moments to share also. Pictures of practice squares, quilts or anywhere that you tried ruler work would be great to see. Have fun and enjoy learning this technique. Remember, that is what quilting is all about.

I borrowed a set for a class I took. (The small rectangular and larger circular ruler.)
I then took a class at my dealer. It was an all day class and I learned a ton. I was very happy that I didn't rush right in the way I normally do and purchase everything in sight. For me at least it is going to take lots of practice. I was focusing too much on manipulating the rulers. Having said that, you could do a surprising amount of things with those two rulers, and then buy special ty rulers based upon the quilt itself and what you want to do with them.