Design moves faster when the team knows what the website needs to say. You do not need polished final copy on day one, but you do need a clear view of your audience, offer, evidence, and next step.
The useful starting set
Gather a short description of what you do, who it is for, the problems you solve, service details, answers to common objections, and real proof such as results, testimonials, process notes, or examples. Also collect brand assets and the words your customers use when describing their problem.
Do not write every page in isolation
Decide which page owns each question. A service page should explain the offer; an about page should build confidence; a guide can answer an early research question. That division keeps the site from repeating the same vague paragraph everywhere.
Leave room for discovery
A good website design and development process helps shape the content as the structure becomes clearer. Bring what you know, then expect thoughtful questions about priority, proof, and the action you want a visitor to take.