There is no 'will' word and no future ending in Finnish: you use the ordinary present tense and let a time expression (huomenna, ensi viikolla) show that it is future. For an intention you can add the verb 'aikoa' plus the basic form of the next verb.
Examples
- Ensi viikolla matkustan Lappiin.
- Next week I'll travel to Lapland.
- Aion mennä huomenna uimaan.
- I'm going to go swimming tomorrow.
- Juhlat alkavat lauantaina kello seitsemän.
- The party starts on Saturday at seven.
The mistake to avoid
Don't hunt for a helper verb meaning 'will' - the present tense plus 'huomenna' is the normal, complete way to say it.
Where this fits in
Mieltymykset ja vapaa-aika, Finnish A2: Talk about hobbies, likes and dislikes, and free-time plans.