You can design a living room online by using a free designing and sketching tool which will help you do all the work from a to z. Here are few things you can do using the tool.
Make a sketch of the living room, give proper dimensional figures to the tool so it can help you give an appropriate layout of the room.
You can design the layout of the living room in either 2d and 3d format. Using the resources and accessories which are available within the software, you can arrange the furniture items in the living room, then you can design the interior using colors and do everything else that you would do in real.