Rod and Staff Publishers is a Mennonite company, writing and publishing traditional school textbooks. As such, they do not have a Web site. However, if you call the company at (606) 522-4348, they will gladly send you a catalog, a scope and sequence, and curriculum samples, which will answer most of your questions.
Personally, I like the math and science series; the reading, not so much, especially the first grade materials, as it is heavy on sight reading. Haven't used the music materials. R&S doesn't publish its own art series; they sell Art With a Purpose, which is "prepared" by Share-A-Care. I like the cursive penmanship instruction, but the first grade manuscript paper is too large.