Could we have some add'l information? How much seating do you need? Will there be a TV in room and how big? What purposes will the room be used? Family room, entertaining, relaxing and watching TV? Is anything in room staying or are you buying all new?

Can you give me dimensions of the room?

I would put a sofa/ loves eat against long wall. A coffee table or fabric ottoman/ tray with two arm chairs kitty cornered. The space is filled but the windows have not been obstructed. Side tables flank couch with table lamps. Accents like rug, pillows and art work. It's overwhelming, so look through Houzz for your one inspiration photo. If you buy solid neutral furniture then you won't be pigeon holed into trying to match. This way the rug you pick could suggest your accent colors. Allposters.com has affordable prints and they frame. The three pieces of furniture do not have to match but they should have something in common.