I have rulers I bought from Jamie Wallen (quilters apothecary), Gadget Girls, and Teryl Loy (she was my dealer when I bought my Innova. She is not a dealer anymore but does rulers and quilt backings online)
http://store-ty5ns.mybigcommerce.com/
And I just got a few and stencils from DeLoa Jones. I believe they all have videos on their sites to show how they use them. I suggest just a few at a time. I have a couple nesting sets of hearts, stars and circles I use VERY infrequently.