The key is getting the knowledge you need and learning internet marketing.
Where should you start? The first item is finding the product/service you will promote on your site. This is called niche marketing. It is best to find a market you can specialize in and focus on. Make a list of topics for a web site you think you might be interested in. Study trends to see what on your list might be appealing to an audience on the internet. You can use major search engines to help you with this and market journals for the topics you have chosen to do your research.