A work permit is not the same as a residency visa. The residency visa allows you to live in Dubai and the UAE for a period of time (usually 3 years). To work in Dubai, you also need to apply for a work permit or labor card. Usually the company you work for will arrange both work permits and residency visas for you and your family, and will explain to you what documents you need. If you’re setting up your own business, you’ll have to arrange the applications yourself. If you’re in Dubai Media City, Dubai Internet City, Dubai Knowledge Village, or one of the other Free Zones, then you should be able to get everything arranged easily and quickly.