The domain name isn't a major factor in ranking or in the eyes of SEO, but the choosing of the domain name can be really difficult because there are a lot of already taken domains, and free domains aren't always the best. So, I will give a few advices to make your select more easily: first all you have to choice a domain name which is easy to remember and try to get the domain of the country you want to target.
Another important thing you have to know is that even your site is about some generic work of your business, the domain name has to be small and simple.
Before you proceed to buy a domain name, first you have to study which are the most popular used keywords on search engines.

IMO, if you are looking at creating a website that will stick around you should choose a name that is good for branding and memorable, keywords be damned.