For your part, you need to first focus and understand why you are having this website?

You might be trying to:

To establish an internet presence
As an extension of our current advertising (phone, newspapers, etc.)
To enhance our company's professional image
To offer company information and give the public a favorable impression
To educate customers and potential customers
To provide better customer service
To increase public awareness of our company's name, brand or identity
To strengthen our position in the marketplace
To strengthen brand identification
To develop a list of qualified prospects
To gain an increase in sales
To sell products directly over the Internet taking credit cards and checks (e-commerce)
To make product or service information available to current customers
To make product or service information available to distributors
To serve the needs of current and future clients
To explain our products and services
To encourage potential customers to contact us by phone, mail or e-mail
To consummate a sale
To bring in new clients or customers to our location
To compete in the global marketplace
To offer links to other relevant sites
To simply establish an Internet presence
To provide information and customer service
To offer a virtual community, a place where users can interact with each other

You might even (quite commonly) be trying to perform a combination of the above things. If you are providing a service, you'll be providing marketing information and other related content. That's fine but understand the principal purpose of the site in this case is to provide a service.

Consider devoting a page to your site's purpose.

Some sites do this through a mission statement or a dedicated page explaining the purpose of the site. It will effectively address why the site was created, what it's about and what it hopes to achieve for the user (site's goal). This is a very efficient method to combine two of your website's objectives.