When it comes to marketing with affiliate programs, you can choose from a variety of options. There are generally no upfront costs to join most programs, but your costs will vary depending on the method you choose to promote them. Advertising costs can include outsourced content, updating content, and creating advertisements. To keep your costs down, only promote products you know and believe will benefit your audience. This way, you can earn as much as possible without putting much of your own money at risk.