The Knitting Fiend has a number of Sock Calculators or Sockulators
that with a calculation of gague and a few measurements will give you a pattern. They are about half way down the page. Also remember that your gague matters and is different knitting flat, or in the round even if you use the same needles.
Also if you knit toe-up you can try them on as you go and adjust for a better fit.