Determine who your main online competitors are. Research how they work, how they market and how big of a market share you believe they have. Sign up for e-newsletters, research their press releases and determine the strengths and weaknesses of each online competitor. You may even need to purchase something from them in order to understand how they complete their sales process.
Internet marketing is the job of creating a convincing message that attracts customers to an online product. Successful online marketers come from a variety of backgrounds, including business, graphic design, writing and IT fields. You can find resources on the web to learn more about Internet marketing. Try taking on a small initial project and add the results to your personal work portfolio. Use the portfolio to interview for jobs in the field, or to find work as a freelancer.