anyone know anything about fashion design?

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so recently I had some ideas to create some progressive/indie/whatever looking clothes. I know very little about fashion design beyond what I've read on the web.

my current tentative plans are to:
- draw design mockups
- purchase clothes from a secondhand shop
- take said clothes to help prototype my design ideas
- after hopefully feeling satisfied about creating said prototype, I would try creating the same item except by sewing
- learn to sew, I don't know how to do this (or pay someone to create what I want but not as fun then)
- try to sell the final product through Etsy(Etsy . com) or local places that sell work by local designers

I'm really way too busy right now to follow through on the above plans but if you have any opinions on/experience with fashion design then I'm all ears.