The best part of being on the web is that a small business can appear as large as a multi-national. By having your Domain Name on your stationery, you are treated as a serious business. Should you not have a domain name today then your business is looked down on. Having your own domain name will mean your address will be better remembered. You should select at least Two One that represents your business name, and one that represents your products services etc.
Many businesses today purchase multiple domain names.
Shorter the better. Easy to remember. Treat the domain name like a your business name. A good domain name helps your site to be selected first of all by search engines and also with ten entries on a search results page, most people pick the URL which seems most relevant to topic. A business name should sum up what service you do, product you sell.