My 1st stop after reading the tute on here...several times, was the library.Got the OBW book & bought the 2 edition....but either one would be enough.There's a ton of pics on here so you can see types of fabrics that work good.You can get fabric in Walmart or Joanns.
It's basically just cutting a strip, then find the next strip that matches the one you cut.I lined up the 6 required & cut the triangles with a 60 degree ruler.Each pile of 6 is sewn in halves of 3.That's as far as I've got, but find the tute.She'll ans your questions.