since the cd's just have the patterns to copy & use and goes with a particular book i recommend getting the book too- you need it to see your cutting charts & all the tips ect. the cd's contain the patterns making it easier to copy them- it is hard to fold the book to get good copies (i had the binding of my books removed & put into 3-ring binders so i can copy pages- much easier for me than dealing with the cd-computer when i just want to make a couple copies)
each book/cd contains different patterns/designs- choose the one that has the blocks you want to use/make.