There are many websites, such as ODesk, Guru, and Elance, on which you can find people and firms to which you can outsource projects. Regardless of the site you choose, the key is to get the largest pool of qualified providers to apply for your project. This way, you have more people from which to choose.
Even if you only hire one, you can go back and contact the same pool of talent for future projects later. Consider applicants as being in your "rolodex" of people to contact in the future.
Below are tips to keep in mind when posting your project. In a nutshell, you want to include all of the information that an applicant needs to know, but do so succinctly.
If anything is left out, you'll have to go back and answer their questions about it later. It's always easier to clarify everything up front.
Create a Clear Project Title
Here, include the work to be performed, on what, and in what industry. For example, "Help Developing Ebook" could mean anything from research to writing to editing to cover design. Compare that to "Writing 10,000 Word Real Estate Ebook." The latter will be more likely to catch the eye of writers with real estate knowledge.
Create a Clear Project Description
This sounds simple enough, but you should try to answer as many possible questions as you can, which means addressing certain areas, like:
Upload samples of what you need
You can write 5 paragraphs trying to explain the final product, or you can show them something similar you have had done before (or someone else's to model yours after). The latter is typically more effective.
Most sites will allow you to upload files to show the contractor what they'll be working with or making. You can also insert links in the project description to websites, files, audios, or videos showing or explaining things more vividly.
Particularly if you are asking the person to develop a website, you must show them examples of other websites you like. If you don't, I can nearly guarantee you'll be disappointed with the results.
Choose the time period for bidding
On outsourcing websites, you are typically given options like 3 days, 5 days, 7 days, 15 days, or 30 days to accept bids. I lean towards giving a longer time period, unless the urgency of your project means that you don't have as much time to wait.
In general, the more time that providers have to find and respond to your project, the more qualified applicants from which you'll have to choose.
Also, some of the best providers are also the busiest, so by giving a longer time frame to respond you are more likely to catch them when they're available.
Follow these tips and my other key outsourcing strategies  to get a qualified pool of outsourced applicants to complete your projects. These outsourcers will give you the manpower and expertise you need to grow your business at a very economical price.