For Affiliate Marketing you will need to register with an affiliate program and you will be able start immediately. You will need to decide what product you wish to promote so you can get started. You are not limited to promoting one product; you have the choice to promote as many affiliate products as you desire.
In order sell your affiliate product you must start what you call a campaign. This is doing all the things essential to market your product. You would be doing things like writing articles and posting to article directories. Your articles will direct readers to your website by way of your link at the bottom of the page.
Another way to promote your affiliate product is by pay per click. This is a paid advertising technique and is recommended only after having gained some experience. Pay per click is bidding on keywords so you can be listed on a web site or Google search page. You pay for every time someone clicks on your site, depending on what your bid was.
If you are new to affiliate marketing your best bet is to stay with free methods of doing business at first. One is writing articles and another is blogging. You can use one of the free blogging sites such as Blogger and use their service to build your blogs. What you will do is create a theme for your blog that reflects the product you are promoting. You can place links on your blog that take visitors to your product when they click on it. They will then have the option of making a purchase and you will get a percentage of the sale...