Make a list of the things you love – if you stick to this list, & you’ve developed a taste for your own style, you can’t go wrong. You can refer to & make that list or review & expand that list further – (go here/text link) -
Learn what home improvements you can deduct on your taxes. http://filemytaxesonline.org/tax-deductible-home-improvements/
Accentuate your room’s major feature item. A sofa is a major purchase item, & one that you will hopefully, have for some length of time. So, consider your choice carefully. The color you choose should not be ‘too wild’ or extreme, unless you have chosen to go really bold & unusual as part of your decorating theme for your room. Its better if you consider a sofa as part of the canvas of your room, with some leeway of course, that you can accentuate further with colorful cushions, throw rugs & other home accent accessories.