I was just looking into this topic myself. I can share a few tips with you that I liked and will be using if I decide to sell this summer.
You want to make your house as personalized as possible. Remove photos, custom family items, etc. It is a good idea to do a fresh coat of neutral-colored paints in all rooms of the house as well as switch out carpeting for more neutral colors. Nothing bright or flashy. If you have to keep your items in the house during showings, place what you can fit into temp storage and only leave out the basics.