Craigslist? No, that would be unlikely to work well.
The thing about a good supplier-reseller relationship is that it takes inter-human trust both ways. The reseller needs to know that the product is good, and that the supplier will deliver respectable after-sales service. The supplier needs to know that the reseller won't deliver over-sold sales, i.e. sales where the supplier will end up looking bad no matter what.
First off, you must register your company, and set up a open, honest, understandable webpage explaining who you are, what you do, which references you have, where you are located, etc. Being transparent about your identity is step number one in building trust.
You should consider starting a blog, and blogging about things relevant to your industry.
Do a comprehensive search, and identify all the leading blogs and BBS's/forums within your field. Write a personalized introduction to each blogger, and let them know you're looking for new business. Create a presence on the forums, and write some good answers. On each forum, make sure to fill out your profile information so that forum members can write you back.
Find people who consume services such as yours, but have professional knowledge of the field. Find online advertising bureaus, SEO consultants, or anyone else who needs content writing on a regular basis, and sell to them. You want to target bureaus and other B2B consumers of your services, because it takes more effort to sell to B2C consumers. In effect you're looking to get the bureaus to "resell" your service by bundling it with their own service and selling it to end users.
While trade shows are much criticized, if you're new in the field, you can still make lots of good connections at trade shows. Go to the next one there is.
You should expect building out a reseller network to take time and energy. Do not make big compromises on your resellers, they represent you in the market, and if they're dishonorable it reflects on you (to a certain measure). Take your time, build trust, and verify how your resellers are handling things.