Working Into the Yarn
Most "self-ruffling yarns" begin as sort of a tube which needs to be flattened out as you are working, so you can find the holes which will be your "yarn".
Most Common Types of Yarn
Each type of Ribbon Yarn is a little bit different ranging from large to fine mesh, as well as railroad, lace and fabric. But the all have holes along one edge that you can insert your hook in to loop them together.
Each type also requires different techniques for yarning over (which will be shown in along with each pattern).
When working with any Ruffle yarns, always turn your work in the same direction at the end of each row, creating a spiral of ruffles on both sides of your work. Alternately, you could turn your work back and forth at the end of each row, causing your ruffles to all fall on the same side of your work.