A valid passport or EU identity card is required for the duration of your stay in Finland. As Finland is an EU member state holders of a USA or EU passport do not require a visa for a stay of up to 3 months. If you intend working while you are in Finland you should contact the Finnish Embassy to arrange the appropriate documentation.
The Finnish Youth Hostel Association offers information on budget accommodation for travellers to Finland:
Finnish Hostel Association Yrj�nkatu 38B 00100 Helsinki Tel: +358-(0)9-565 7150 Fax: +358-(0)9-565 7150
For visa and immigration related enquiries you should contact the Finnish Embassy:
Embassy of the Republic of Finland 38 Chesham Place London SW1X 8HW Tel: (020) 7 838 6200 Fax (020) 7 235 3680
If you require UK representation while you are in Finland you should contact the British Embassy:
British Embassy Itainen Puistotie 17 00140 Helsinki Finland Tel: + (9) 22 86 51 00 Fax: +  (9) 22 86 52 62 email: firstname.lastname@example.org