Content, content and more content. The developer doesn’t know your business as well as you do. So it is up to you to deliver the content that’s going to appear on your website.
List the different pages you want for example:
- home page
- contact me
These headings and sub-headings are helpful for developers as well as visitors to your website. If you know them that’s great, if not that’s ok. A good developer will offer suggestions and explanations to these things.