Domain name is very important to a website, just like how a company name is important for a company. Hence, picking a good domain name is just as important. Before you rush out and choose your domain name, you might want to consider these points. Pick a domain name that is easy to remember, the domain name itself shall suggests the nature of your products / services, or serves as a strong trademark.
What makes a good domain name?

1. Short. Ideally the domain name shall not more than 10 characters
2. Descriptive. A good domain name suggests it's business nature just by looking at the domain name itself
3. Easy to spell. Make sure you can tell others your domain name easily via the phone
4. Good extension. If it's possible, get a domain name with .com always
5. Keywords. Include descriptive keyword that describe your business, or keyword that you want people to find your website when they're searching for it

Well, it's almost impossible to find a domain name to fulfill all of the points discussed. However, use these as a guidelines, and the more points you hitted, the better your domain name is.