A website is the most cost-effective method of promotion/marketing.
A website can supply basic information and a means of getting in contact.
A website can help your business increase profits and make it easier for potential customers to find you.
A website can help you collect users for an email marketing campaign.
A website can help you evaluate your marketing strategies by providing visitor stats.
A website for any business these days is a must; it is a great addition to all your marketing materials.
An Example: http://lincolnwellnessaz.com/
In a standard website (.html based), a developer/designer creates a template shell, saves each individual page as a separate file, and uploads the content. When an item needs to be changed, it has to be changed on the individual file and re-uploaded. If you’re a small business with a small web-budget, you don’t have resources to have someone change a single word every time you need one changed.
WordPress does things differently. Instead of storing the content in files, it stores the content in a database. The database is either stored on a different part of the server, or sometimes on a different server altogether. Whereas a static page contains both structure and content, the WordPress theme envelops and wraps the content in the theme files – meaning you can change, edit, delete, and add new content using one set of template files (Studio NashVegas).
20 Best WordPress Themes For Small Business - Not available at Wordpress.com
Ultimate List Of 15 Necessary Wordpress Plugins For Any Installation
Basic HTML: http://www.mcli.dist.maricopa.edu/tut/