Be original. What's different about what you have to offer ?
Be as specific as you can about the service you are offering and exactly what the Buyer will receive if they purchase your Hourlie.
Set a realistic delivery timeframe. Late delivery will lead to unhappy Buyers and will affect your rankings.
Make your Hourlie stand out with great quality images or even video illustrating the service that you are offering.
Make sure your Hourly meets all other posting policies.