This is a new frontier, with the field changing rapidly as people try new techniques and capabilities improve. Put up a page, a brochure, a catalogue, a database, etc. You can be creative here. Be clear about the purpose of your web site. Think of ways to bring people back to your site again and again.
Many companies offer technical support or customer service.
Just having a web site isn't enough. The chances of people stumbling upon it by accident are low. Integrate your marketing so that all aspects work together. Some businesses may choose to join a cybermall , a group of businesses that share one site. Many malls provide services such as page design, statistics about visitors, and order forms.