E-mail address and phone number should do the trick.
Please be as specific as possible.
Include things like age, gender, location, attributes and why they should use your product or service.
For instance if your after a website, how many pages are we roughly looking at? Would you like any specific elements like an Image Slideshow, Blog, Flash animation etc?
Add any links to existing websites/resources you've seen that you like, and give a brief description of what it is you like about them.