People in Sweden speak Swedish and also English, so making the travel reservation will be quite easy. The payments for the travel can be made e.g. by using a credit card in the internet. The connections from Finland to Sweden are outstanding and there are several alternatives to choose from, including from low cost airplanes to luxory cruise ships, which are actually very reasonable priced. The main airport in Stockholm, Sweden, is called Arlanda, where you can fly directly or by sailing in the luxory cruise ship to Stockholm - in that way the holiday begins already in the Finnish side of the journey. Busses will take you from the harbour to the Cityterminalen from where the express trains "Arlanda Express" and busses "Flygbussarna" travel to the Arlanda airport. Often it is possible to find excellent travel deals from Sweden, especially during spring, later in the summer and nearby the Christmas and New Year.
The prices in the Swedish travel sites are given as the Swedish Kronas. One Krona is about 0.11 euros or 0.12 US dollars. 1 euro is about 9.5 Swedish kronas, whereas 1 US dollar is about 8.1 Swedish Kronas.