New to fish and weighing my options..

[Sasha2]

So I am curious how much work would a 55 gal be? Do you change the water weekly? Can you tell Im a complete noob here? I also have an empty 30 gal so may start with that..

I love fish, growing up my mom had at least 5 tanks full of various kinds of fish.Ive personally only had bettas, goldfish(many deaths as well, to my shame), stuff like that in little ten gallons.But the work of cleaning a larger tank out is just daunting to me.Especially a large 55 gal.
When I start reading up on all the nitrates and ammonia levels and all, I get confused and give up.It just seems a bit over my head.We have very hard water here too, lots of mineral content, coats everything with that white stuff after awhile.
Right now I buy bottled water for our bettas from the petstore in another town, they have better water then ours.I couldnt do that for a larger tank.

So what about filters, there are so many kinds....Wow I get overwhelmed just thinking about it..Where does one start?