Hey renegade, I'm sure that Okwaho will have some valuable advice once he sees tyhis threadm bu in the mean time, here's how I handled mine:
Wash 'em in a soapy solution to clean 'em up then soak 'em in colors of your choosing, they take a dye very well. after they've dried, sort 'em by size and thickness (for uniformity's sake" and nip off the ends with nail clippers. you'll need to flatten 'em before you start working with 'em, so you'll need something rigid for that purpose. I used to use my teeth, but haver since changed that practice considering the possible infections and dieses I might have contacted.
I started off practicing folding the quills by wrapping them around a wooden coffee stirrer, though these are getting pretty scarece anymore.
I'm sure you'll get more, and better advice from the more knowledgable quill workers, but this was how I get started.
Goodluck :hatsoff: