Before you do anything, start packing! You will have to do this anyhow, when the house sells, so get a jump on it before you even call a REALTOR to discuss listing it. Pack away the family photos, the chachka's that you've been collecting for the last 25 years and remove anything that might be a distraction to a potential buyer. You want them to be able to visualize their furnishings in your home by staying focused on the rooms not what's in it!
You may have an older home and have not updated it throughout the years. If you don't have the funds to replace faucets or update appliances, the next best thing you can do to get more money for your home is almost virtually free! The house needs to sparkle, old or new, and smell good, too! Scrub the baseboards, wash the windows, tidy up the closets, remove excess furniture, dust the fans, clean the vents. You get my drift! Your home is competing with model homes and must be looking its best, both inside and out! Your REALTOR should be able to make suggestions on items you may have missed after you list it.
Where you price your home, initially, is most important. Pay close attention to what your current market value is. Your REALTOR will go over the comparables with you to get a price range and determine a marketing plan for you to get your home sold. Price it right, and stay focused on where you want to be after the home sells and you should be well on your way to new destination!
When you have acquired a contract, your REALTOR will assist you in finding your next home and keep you on track to a successful closing! Good luck...