The easiest way to earn a decent living is trying your hand at affiliate marketing. There are many companies that will allow you to join to promote their products. Many will pay you 50 percent for each sale you get under your name.
You can promote the products on your blog. Just make sure that you offer helpful information to the customer. When you write about the product, 75 percent should be useful information and 25 percent should be spend about the product.
Find a niche that you know