Most websites that offer torrent download will use adult advertising on the website. This is basically the only form of advertising that you or companies will allow you to use on a torrent download site. The only other way might be to sign up with a link shortening company and use short links on the site. This way if they click on the download link an ad will be displayed. You are paid for the ads when a person clicks on your link. I've seen several torrent download sites use this to earn money.