It depends on the audience and purpose of your site but there are some pages that all website should have:
Homepage
The homepage should have text about your business and services and include key words that describe your business and what you provide.
About
You don't need to have an about page if it will just repeat the homepage. Different information could include more detailed information such as how long you have been in business and some of your achievement such as awards, contracts or past successes.
