Before starting, it helps to have a clear description of your services, your main customers and the most important action you want visitors to take.
Prepare your logo, colors, photos, copy or at least rough direction. Everything does not need to be final, but direction helps.
Collect common questions, reviews, real projects and process details. This makes the website more convincing.
The clearer the goals and materials are, the faster you get to a website that looks professional and works for the business.