Thanks for the additional comments. That PDF file had a lot of useful information although still missing a lot of info on the primary uses of various categories of stamps. I will look into the books that were suggested. At this point I don't anticipate getting into serious figure carving. I mainly expect to do some decorative work on relatively small projects. Maybe a picture of a bird, flower, leaves, some decorative trim.
I am still in research/study/learn about stuff mode as I have gathered some supplies and tools. A lot of lurking here has taught me a lot.