Do yur product development before you sell and DON"T sell your sample. I've done that and had to "reinvent the wheel" when I forgot wtf I did to make that pendant or whatever. Also, when you get something you like, TAKE NOTES. This makes it much easier six months (or six days) down the road when you do not remember how you made that piece.
I have one really stunning green seed bead wreath I made as a sample pin, I love it. I can't figure out how I made it, although I've tried several times!
Be organized about writing down what you use, what you bought, how much each bead (or unit) cost you, the average amount of needles you use in this project, thread, etc. It's easy to forget that all those $2 tubes and $3 packages of needles add up, but they do.
Judi