As far as getting bigger furniture, I recommend thrift stores, flea markets, and yard sales all the way! These are great places to pick up some key items without spending major money — especially items in the rustic, farmhouse style.
I think the living room you have is already looking good! The inspiration image you have features a lot of whites and wood tones, so maybe try painting those black shelves white and bringing in a wood table or some wood frames on the walls!
Hope this helps! Let me know if you have any more questions!