Well as you already join affiliate network, now you already have a product to promote, but where should you promote it? If you already own a website, all you have to do is to link your affiliate product with your website. Generate more traffic to increase probability of them to click at your affiliate link. Make sure that your website is relevant with the product that you are promoting. If your website is talking about health promote something that relevant with health for example ‘tips on how women can stay fit and healthy’.
If you don’t have a website, then you have to build one. All you need to do is to know basic html. Yeah I know, its sound complicated, but don’t worry there are plenty of software that you can use like frontpage, dreamweaver, and etc. with these software, website building become more easier without learning all those complicated html.
This site might help you to build your website

I am sure you already heard about blog or you already have one. Blog is an online journal and it is very easy to setup and organize. All you need to do is to fill your blog with content and link your affiliate link into your blog. You can start blogging with these blog below.

Blogger.com
Wordpress.com