Measure all your furniture pieces and make a template to represent each. Use the same 1/4 inch equals 1 foot ratio you used earlier for the room. Label each of your pieces so that you will know which piece you are putting where.
If you want to reuse the pieces, cut them out of cardboard - like the back of a tablet or a damaged gift box. Another good idea is to glue fabric onto the template that matches the actual fabric of piece. It may help you visualize the way the furniture will interact.