Make it a priority -- the web site can be delayed and the cost can rise if the designer is waiting for approval or material for the site.
Work with the designer to create a clear vision of the web site -- changing you mind mid-stream can increase the cost dramatically.
Keep your web site decision-making committee small -- a large group can take longer to make a decision and delay the site.
Establish clearly who is authorized to approve designs and make changes -- if you have a team approach, make sure the team is communicating with each other and not giving the designer conflicting directions.
Do your part --invest the time to review the work completely at each stage.
Deliver your text in an electronic format and in a proofed state -- hand written pages or loose pages require the designer to scan or type the information.
Give the web designer an original of the artwork -- copies or copies-of-copies lose detail and require a lot of clean up.
Use photographs that you already own -- good quality, clear 35 millimeter prints or negatives or digital images.
Utilize print material -- what have you already created that can be translated to the web.
Do not put information on the web that you are not committed to keeping up to date -- plan and budget for web site maintenance.
Build your site in stages -- set a good foundation (site architecture) and make sure it works.
Expand sensibly -- expansion should be based not only on the "plan" but also on the feedback.