Are you a talented writer? Do you have certain way with words? Can you easily create informative articles that are fun to read? Do you have in-depth knowledge about SEO article writing? Then, you can convert your skills to money-making machines by writing articles for individuals and companies that need them.
Here's what you need to do:

1. First thing to do is to look for potential clients.
   Don't worry as you'll surely not have a hard time doing this because there are hundreds and thousands of people in the online arena who are in need of SEO articles for their blog and website.
   To avoid getting scammed, make sure that you research the website before you write the articles.
   There are several stories where the ghostwriters were not paid.
   If you're writing for an individual, ask for escrow payment or ask him/her to send the payment in batches.
   It's best if you get paid for every 5-10 articles that you write.
   
2. Build your own website.
   While looking for potential buyers, I would advise you to create your own website to give interested parties a place to visit if they want to get your services.
   As you're selling SEO article writing services, it's important that your website have impressive page rank and that it contains several amazing articles that will speak volumes about your in-depth knowledge about SEO article writing.
   
3. Promote your website.
   Find time to promote your website in the online arena.
   The more traffic you attract, the better your chances of making decent sales.
   Make use of proven traffic-generating tools that include article marketing, social media marketing, forum posting, search engine marketing, video marketing, blogging, etc.
   Yes, it will take a lot of time but you can be assured that your effort will pay off big time.
   
4. You must have great reputation.
   Your potential buyers will have a lot of questions in their minds before they'll hire you.
   These questions include "Is this freelancer good enough?" "Does he have proven track record?" "Is he reliable and trustworthy?" "Will he be able to deliver great, properly optimized articles?" Give these people valid reasons to trust you.
   Start by working on getting known as somebody who's very good in SEO article writing and somebody who wouldn't let a client down.
   
5. Charge appropriately.
   How much should you charge for each article that you write? Well, that will depend on your skill level and your standing in this endeavor.
   If you're just starting out, it's best if you charge a bit less so you can attract more potential buyers.
   On the other hand, if you're already considered one of the best, you can charge as much as $10-$20/article.
   Right now, there are eager buyers who are more than willing to pay a lot of money to get the services of competent, highly respected article writers.