How to design your room
I have personally moved over hundreds of couches chairs and dressers. I noticed it's hard to find that right place for that couch or dresser too big too small corner too sharp. This happens all the time.
First: Git rid of that old broken or out of style piece of furniture. Broken chair, missing spring mismatching pillows. Too much clutter is just holding you back so donate, donate and donate. Trash whatever else you can. Space is your most valuable asset so emptier space is better than cluttered space.
Second: Measure your space, if your new piece of furniture doesn't fit, it is a good sign you didn't measure your area, or you didn't account for that extra piece of furniture you wanted. A bad mistake is to go back to first step. It is always good to add an extra 5 to 10 inches to each piece before buying it. Very important make sure it fits through your door or it can be disassembled. Walking space and breathing space is so important. Less is better!
Third: Color is so important, that it must fit the shade of color that is most common in your space. If your wall is light tan than you go for a light blue, white or even gray. I like to match with my eyes as I would Imagin it. Dark colors can work with light wall as long as all the furniture is similar tone dark colors. Remember you can always paint a room really easy and fairly inexpensive. I recommend light colors because you can change it easy and it will make your room look larger. You can add patterns on the walls to match your furniture can be huge.
Fourth: Style, Rustic, Midcentury modern Shabby Sheek or Retro are just some of the styles. 1900's furniture is not most likely going to fit with IKEA, Materials as well wood with wood and metal Felt should me matching with couches' and chairs. Patterns should be similar throughout your room.
S=R&R Space equals Rest and Relaxation
C=M&D Clutter equals Mess and Distress