It's worth giving considerable thought to the selection of a domain name for your business. It should be short, easy to spell, and easy to remember.

You may well be tempted to use you business name, which in many cases may be ideal but it is always worth considering simple alternatives. An Isle of Coll grass cutting company, for example, may have a lovely local gaelic name but may be better off, for web business, using a name that refers to Coll, grass and cutting, e.g. collgrasscutting.co.uk.
Since domain name registration is reasonably cheap it may also be worth considering the purchase of more than one domain name and point all the traffic to your prime site. This is common practice, for example, to purchase your-domain.com as well as your-domain.co.uk.
For the purpose of search engine optimisation, it helps to have your keywords in your domain name.