Some helpful information would normally include.
•Details about the domain name for your site.
•Details of your design preferences - are we designing the site from scratch, do you have a logo or branding to design around. Are there any other web sites that you have seen that you particularly like design wise.
•Timescale - do you have a fixed deadline, or can you be flexible.
•How many pages do you require.
•Will you need a booking form, questionnaire or any other data gathering form such as this one.
•Any other information you would think might be helpful in the development of your site.