First step is to engage a realtor in your area - you want to understand the market and market value of your property. The realtor will also have advice on how to present the property so it will show well and sell at your price and within your timeframe.
I suggest you interview 3-4 different realtors. I've included a booklet you can read that will give you a lot of info about market value, increasing your value and how to choose an agent.
Best of luck to you!