First, choose a name that describes your site. Try to get as much information as possible in the name. For example bryancars.se is a good name because it tells us that bryan is selling cars on his website. This is a better name than bryansweb.se, which does not give us any insight into what is actually on the site.
You should also select a domain name that is specific enough to be found by a search engine.
Try to limit the amount of words in the title. Also, I think it is smart to avoid hyphens and other characters, which can easily be overlooked by Web users, bryancars.se are easier to remember than bryanautomobilcargarage.se, have a name that is concise and concrete.