In principle, we have full freedom of establishment in Norway. You can attempt to sell whatever goods or services you like; it is up to the market to decide whether anyone is interested in what you have to offer.
However, many rules exist to uncover production and marketing of products/services that may be directly harmful, or that society wishes to regulate for other reasons. It is important to look into applicable rules and regulations in advance.
You should pay particular attention to the requirements that apply to serving food and selling alcoholic beverages. Regardless of their line of business, many entrepreneurs will be required to apply to the municipal authorities in connection with building, change of use or alterations to premises.
A good place to start is to discuss the matter with an advisory service or with one of your own contacts who knows about such things.
Under the following links you will find an overview of applicable national requirements (permits/licences) for various industries:
Agriculture, forestry, hunting and game keeping
Fishing, hunting at sea and aquaculture
Mining and recovery of crude oil and natural gas
Industry, manufacturing, repair and installation of machinery and equipment
Electricity, gas, steam and hot water supply, waste collection, recovery
Building and construction activities
Wholesale and retail trades, repair of motor vehicles etc.
Transport and storage
Accommodation and catering activities
Information and communication
Financing and insurance business, property management
Professional, scientific, technical and business services
Health and social services, teaching
Cultural activities, entertainment and leisure activities
Other service provision