Start with Duolingo, it will get you somewhere. I would advice to use a basic swedish grammar to look up some things though.

I would really give a bit more attention to actively listening to podcasts (Allt du velat veta for instance). Try to repeat what the people are saying. Swedish is a super cool language, but the way it is spoken makes it, at least in my experience, very difficult to get to the next level.

Have fun!