We also rented a storage unit and put plenty of furniture in there to leave plenty of open space in our house.
We nearly emptied out drawers, cabinets, closets, etc. to make those also look larger. We had lots of knick-knacks at the time, which I also mostly boxed up, as well as plenty of the plethora of family pics. The experts typically mention doing this to make it seem less "your" space and to allow a potential buyer to envision their own belongings.
Fix anything that needs fixing and clean walls, retouching paint, etc. Keeping a house clean is so impt for the showings...I love to vacuum to make the carpet look "fresh," lol!
Check out HGTV online - plenty of great articles, advice, forums, etc. and maybe you can see some shows online, too - not sure about that though.
Best of luck to you - I hope it sells VERY quickly