This is the specific address of your company. Domain name registration is done through an organization called InterNIC which charges individuals and companies a fee for reserving the name. Many ISPs will take care of this step for a nominal fee. An advantage is that it is free with your service plan. Consider that the computer monitor is a very different medium than the printed brochure.
Customers tend to expect more immediacy and interactivity.
You will want the text to flow easily. As a general rule for commercial sites, unless you are quoting passages from a printed piece, explaining a complicated process, or intending that the document be printed, break up the text often. Use headings and bullet points freely. Branch content off onto pages that users can visit if they are interested, but ignore if they are not. Also determine your needs for a secure server environment if you are conducting commerce.