Below is a list of the basic MINIMAL 'functions' your web site should have; E.g.

ABOUT US
Introducing your company and it's products/services Don't make it too long -1 page is enough.

OUR PRODUCTS / SERVICES
Introduce your products or services in more detail

CONTACT US
A 'contact form' that allows your clients to contact you and that does NOT show your email address on the web page. This is to protect You from all the 'email harvesting' robots that go to your web site and 'grab' your email address for spam purposes.
You will find an excellent article about what email harvesting is here [1]

FAQ
This is where you add all the questions and answers your customers have This way, your customers can quickly find answers to their questions without having to call you.

SEARCH BOX
This is a very important part of your web site. As your web site grows and have more and more information in it. How are your customers going to find what they need? The search box is the answer.

We hope this article has helped you understand how to make your company web site more useful.

Thank you