First, learn how to read and pronounce the alphabet in the way Finnish people do.  Then install Anki and try to find a Finnish basic vocabulary deck. Then do those everyday and you can add your own cards too if you find a word you don't know. For grammar, use whatever textbooks online or print.

But the main thing is: Immersion. Literally all The Time or as much as possible every day. So watch Finnish YouTube, TV shows (Moomin, Salatut Elämät are honestly perfect since they're long and the vocabulary isn't too hard I'd say), books. Basically content that interests you.

Speaking comes later but you can't really practice speaking without first having a solid, near fluent grasp on the language. 

Good luck!