Non-EU/EEA students need a student residence permit. After you receive your official letter of acceptance, you can begin the student residence permit application online at Enterfinland.fi. Remember that you must personally visit a Finnish embassy or consulate as part of this process.
After your graduation, you may apply for an extension of your residence permit to look for work or start a business.
You can find detailed information on the residence permit requirements and procedures on the Finnish Immigration Service (Migri) website.