The major language of communication in Sweden is Swedish, though 80% of Swedes can speak English. It is advised to start learning the language as soon as you can so as to enable you to integrate easily.
Each municipality in Sweden known as (kommun) has made provision for newly arrived in Sweden to be registered in the municipality Swedish Language school called Swedish language for immigrants (SFI).
The courses provided at SFI will teach the basic knowledge of Swedish and what you need to know about the society.
Välkommen till Sverige ( Welcome to Sweden)
If you are yet to register or yet to be admitted to SFI in your municipality, you can start basic introduction to Swedish online course.