Looking for advice, putting together a blog that discusses topics in link building. I would like to recommend a company that provides link building and other SEO services. I work full-time so can not take on any more work but want to be able to refer someone in case I get any inquiries. My goal is to create some passive income while developing a lead source for an agency. I want to make sure anyone I endorse will be an established U.S. based company. Is affiliate marketing the way to go?