There are three main sources for you to get the content you need.
They are:
Write it Yourself
Hire a Ghostwriter
Use Other Writers
There are pros and cons to each source but by using a combination of sources you 
can accumulate a well-rounded body of content for your use. Here are some of the 
points to consider when using the different methods for creating content. What 
works best for you will depend on your level of writing ability, what the content will 
be used for and your budget, among other things.
Write it Yourself
Writing content yourself is not only the least expensive method, but allows you to 
inflect your personality into the content. This can be very useful in attracting a loyal 
customer, especially through newsletters and articles.
Writing content yourself can also be beneficial when writing about a topic of which 
you are particularly knowledgeable about. If you can inform your customers on a 
topic it may be difficult to find another writer who can impart the same information 
accurately.
However, if your writing skills are extremely poor you may need some assistance. 
Whether you simply need to hire a proofreader to catch grammatical errors or an 
editor to rearrange your thoughts and point out where your information needs 
clarification, you may still be able to create your own content for less cost than 
hiring a writer while maintaining the originality of your content.
Hire a Ghostwriter
When you need more than just a little assistance, whether it's because of time 
restraints, lack of writing abilities or you need a writer with knowledge of a topic 
you aren't familiar with, you should consider hiring a ghostwriter.
Ghostwriters are individuals who will write content for you (website, articles, 
ebooks, press releases etc.) and give you all the rights of the original author. You 
pay them for their time and abilities and in exchange you claim ownership of the 
material.
Ghostwriters are valuable to businesses that need quality content on topics that are 
easily researchable by the ghostwriter.  You may also find ghostwriters who are 
experts in their own field but hire themselves out as writers as a side business.
For more detailed assignments you can also hire a ghostwriter to use your 
knowledge or research and compose the information in a manner which reflects 
your own 'voice'. The ghostwriter will need to work very closely with you and 
develop a style of writing that will emulate the way you express yourself. 
Ghostwriters have often been hired by famous people to assist them in compiling 
their autobiographies.
The cost of hiring a ghostwriter is variable depending on the level of expertise 
required, the amount of research needed and the nature of the assignment. When 
hiring a ghostwriter you should make a 'work-for-hire' agreement which means 
that the writing cannot be resold to another buyer or used by the ghostwriter for 
other purposes.
Use Other Writers
There are really two categories of other writers you should consider. Writers who 
offer their content for free and paid writers.
Paying for a writer to create content for you is not common for small businesses 
unless the expertise of the author is needed for the material to be useful. Secular 
magazines often pay writers for their work which can vary in cost depending on the 
background of the writer and the size of the publication. Fees for writers can be 
found in the 'Writer's Market' book which is a resource for writers looking for 
paying jobs.
Writers can be found through associations, recommendations by other people and 
from freelance websites like www.elance.com. When hiring a writer you should ask 
for samples of their work and have them make an agreement for permission to use 
their work or the exclusive rights to the work.  Without an agreement in place you 
may be facing copyright infringement claims or find the writing published in another 
place without your knowledge.
Working with writers, proofreaders or editors is just another part of doing business 
online. Making use of these services can help you project a polished, professional 
appearance to your visitors and readers while still giving you control of the 
information presented.
As with any contract work you should be careful to choose individuals who respect 
your needs and deadlines and can provide quality work while at the same time 
recognizing the value of the services these individuals are providing to you by 
giving them enough time to finish your projects and adequate pay.
If you want access to a variety of information you can use a service such as http://www.InfoGoRound.com which 
gives you access to a large database of articles written by ghostwriters. You may 
change the information or add to it without permission as would be required if 
using free to reprint material.  Tim Robinson writes for http://www.SageDot.com and frequently uses content from 
InfoGoRound.