The very first thing you should do is to find a real estate broker/agent. It is not a good idea to sell it yourself simply because your house is a major invetment and you would like to get the maximum return on your investment. It is also very time consuming and complex. We therefore suggest that you choose the right professional.

It is a good idea to make a plan and a time-table by which you would like to sell your house. Considering factors such as when to move and wheather or not you plan to buy another home etc. will determine the time-table. You may need ample time to fix things inside and outside of the house. You will need to clean and prepare for showing. Get the house presentable and properly functioning.
Read more about preparing your house to sell: Tips for sellers