This was posted once before, but it didn't get stickied. You don't have to fill out all of these things, just the things you have a preference for. Please fill out at least some of the things. It helps the artist get a better understanding of what it is you want. Which turns out better for you because you get what you want.

[ The Name You Want On The Sig ]
[ The Sig Type ]
[ Colors ]
[ Theme ]
[ Additional Text on The Sig ]
[ Text Fonts (If You Have A Preference) ]
[ If You Would Like Pics ]
[ What Pics You Would Like ]
[ If You Would Like An Avi ]
[ What Text Do You Want On The Avi ]
[ Pixel Dimensions ]
[ Any Extra Information You Think Is Relevant ]
[ Who You Want To Make Your Sig ]
[ A Contact Address (ICQ, MSN, AIM, Yahoo!, Email) ]

-Size Guide-
http://img78.photobucket.com/albums/v314/jay_sigs/sizeguide.jpg