Pricing it competitively. The first month is going to be the most important few weeks during your listing period. Buyers are always searching the internet for new listings so don't miss this valuable opportunity.
Secondly, condition of your home is very important - no dripping kitchen faucet etc. because if little maintenance issues that are noticeable to a buyer, can put them off making an offer. Also, presentation of your home i.e. no clutter, have your home really clean and work on staging it for the sale. If you have children, put their toys away in pretty baskets, fresh towels in the bathroom, kitchen counters cleared off. Finally, your curb appeal to get the buyers through your front door.
If you have photos of your yard from the summer or spring with pretty flower borders it is a good idea to leave the photos out for a buyer to see.
Also - discuss with the Realtor you choose to list your home, what his/her marketing plan is. Marketing and pricing a home are extremely important.