I would like to study library courses because I would like to work in a Library. Do you offer such a service?

We don't offer library courses. You have to have a degree on information and libraries studies or business school level information studies to work in a library.

Below is information from our previous answer (dated 7.4.2010):

"You can study information and library studies in many places in Finland depending on the level you want to reach. You can do higher level studies in three universities: Tampere, Oulu and Åbo Academy (=Swedish speaking uviversity in Turku).Tampere University is maybe the most wellknown of these.

You can also do the business school level studies in Seinäjoki, Oulu, Vaasa, Turku and Helsinki. There are also various open university courses for basic level information studies after which you can continue your studies in the above mentioned places, but you have to pass the entrance exam." 

Here you can find the updated list of schools offering library courses. The list is unfortunately only in Finnish, but you can find information in English by clicking the link and exploring the schools' websites:
https://www.kirjastot.fi/kirjastoala/opiskelu?language_content_entity=fi

Here is an interesting article about library education in Finland:
https://now.libraries.fi/education.html