When you decide to join the SEO space you might want to really think about if you should build the SEO product or use an established one. One way to do this is to use an existing SEO services offering through a reseller company. These folks offer a white label SEO program that you can sign up for. Once you are in the program, you can sell their SEO services as if they are yours. Thus the reselling part... It's a good way to start out. You can always decide to stop being a reseller later if you want and bring the delivery back in-house. That's your call.