Its depends on which module you want to work on first select your niche and start building the content and place affiliate ids accordingly.
Select the products you want to promote and then write reviews on them on your forum, linking to the products. Also you must focus on driving traffic to your site so people can see what you have.
select some products that are related to your interest or your site. then start promoting them . select a product which is less competitive. it will be easier to achieve goals.