http://www.businessstartupqatar.com/tourist-visa-qatar-work-visa-qatar/
Summary:
If you’re planning to move to Qatar, you need to organise a work visa – Qatar differs from some places though, in that this is a requirement to be fulfilled when you arrive, rather than prior to departure. If you’re travelling just to see the country or visit friends, you need to get a tourist visa; Qatar has plenty to offer for either type of visitor, but you need to make sure you’re acting in accordance with their legislations.