It was by pure chance that I was reading an article written by a reporter. The article was about scams but at the end, offered the services of a Canadian Company. The company was called Wealthy Affiliate and they had been in business for 15 years and had at that time over 500,000 members and this somehow looked very serious. Today they have 760,000 members, which means they are certainly doing something right.
Always disclose your affiliate relationship. Most visitors will probably understand that graphic ads will lead to your getting paid, but if you write a review or use an in-text link as a recommendation, you want your readers to know that may lead to compensation as well. This ensures you retain transparency and trust with your readers, but also, it's required by the FTC's endorsement rules.