There are useful websites that are good to know when you move to Finland. Many provide an overview of life in Finland and useful links that will answer many of your questions.
Here’s a few to get you started:
Infopankki – provides information about life and services in Finland in several languages
City of Helsinki – provides information about activities and services in the city
Hey Helsinki – a blog about life in Finland, including useful tips and things to do
Nut Island’s Peace – a blog with lots of useful insights into Finnish life