Great Question Gena. The two most important items to remember when preparing your home for sale (and coincidentally that least expensive) are CLEAN and BRIGHT. Now matter how clean your home is, make it cleaner. A brand new kitchen countertop means nothing if it is cluttered and messy. Once you have removed everything you think you need to remove from your home, have a friend go through with you and get rid of half of what is left. After all, if you're selling your home, start packing!
Next you need to make the home bright. Replace and/or clean all of your light bulbs. make sure they are all of the highest wattage capable (unless they are for accent purposes only). Clean your windows inside and out. Paint dark rooms a lighter color. Dark houses just don't show well. And homes that don't show well, don't sell well.
Take these two items to heart. You will invest some time and a little money, but you will reap big rewards by selling your home faster and for a higher net price.