The citizens of the following countries can obtain a vis aon arrival: The United States, Britain, France, Italy, Germany, Canada, Australia, New Zealand, Japan, the Netherlands, Belgium, Luxembourg, Switzerland, Austria, Sweden, Norway, Denmark, Portugal, Ireland, Greece, Finland, Spain, Monaco, the Vatican, Iceland, Andorra, San Marino, Lichtenstein, Brunei, Singapore, Malaysia, Hong Kong, and South Korea.
For more details please consult: http://portal.www.gov.qa/wps/portal/topics/Visas,+Passports,+Official+Documents/visas

Shooting permit is necessary. 

ATA carnets not accepted for teh time being. The service will be launched soon.

There is no VAT.