Firstly, walk around your house (from kerb to back fence) as if you are a potential buyer, and have an honest look at it.
Kerb appeal - the house should look attractive, should not look as though old people live there unless price is very low!(I'm old, so am free to say this.)
Garden - make it look immaculate, and if possible, as if it needs little attention.
House - immaculate, and decluttered. It should look as if there is plenty of space. If you have grandchildren's toys, tidy most of them away, just leave a few on show. If necessary ask friends/family to store stuff for you until after the move.
Make sure the house is well presented for the photographs.
If you have pets, ensure the house does not smell, and if necessary try and have dog or cat out of the house for any viewings. I was once attacked by a Siamese cat when viewing a house, and needless to say, it did not endear the house to me!
Be able to pass on local information regarding shops, GP, schools, churches, etc to give to viewers. Have information and guarantees about the house to hand so that you can answer potential questions.