Define the objective. Write one sentence describing what the website should achieve in the next twelve months.
Confirm your service list. Publish only what you can consistently deliver; a shorter, honest list converts better than an exhaustive one.
Collect your assets: logo files, brand colours if they exist, photography of real work, team details and accurate contact information.
Draft your core content. Even rough notes about each service, who it serves and what it includes will speed the project considerably.
Decide who will own the site after launch, and agree how updates will be requested and handled.