Help!! what are some ways I can make cost effective shelves?

I am in the process still of moving to my new home (its been a long process since I am a teacher and a single mom so I haven't had much time)
I need ideas to help me decorate the house and organize it.
like I said I am a teacher, and have tons of books from both college; as well as, the books I like to read.
I need to de-clutter the spaces where the tubs are with the books, what are some ways I can make cost effective shelves?

The style I am going after I best describe it as modern rustic. I have pictures of what the house looked like when i fist moved in. (living room specially)
in front of this window i now have a dining table
in front of the fire place is my dog's crate and next to the coat closet door i put up a home sweet home frame. on that wall that as you turn left from the coat closet, I put up another frame with the what is family text.
on the wall that is on top of the fire place i put a stencil with a bible verse. On the next wall I put up a panting i made at painting with a twist. (starry night)
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