To work and live in Sweden you must register your right of residence with the Swedish Migration Board within 90 days of entering Sweden.
You must also apply for a Swedish ID number from your local Swedish tax Office.

Registering your right of residence in Sweden
For detailed information on rules and how to register see the website of the Swedish Migration Board:
Swedish Migration Board

Swedish ID number
If you move to Sweden and intend to live there for a year or more, in most cases you are required to register with the Swedish Population Register. The Register is managed by the Swedish Tax Agency. Your ID number is a necessary part of daily life in Sweden as it is used in all transactions with authorities, shops, estate agents, banks etc.
Read more on:
Population registration in Sweden

Finding a job and working
The website of the Swedish Labour Market Board contains useful information to finding work in Sweden
Swedish Public Employment Service

Recognition of qualifications from other countries
Swedish Council for Higher Education

Swedish Taxes
Information on Swedish taxes can be found on the website of the Swedish Tax Agency:
Swedish Tax Agency

General Information
Information on moving to Sweden, learning Swedish, health care, social insurance, education, culture, buying a property, driving in Sweden, taking your car and pet to Sweden and much more can be found on:
Live in Sweden