Internet marketing is a number of things. And true success in the field involves an immersion into several skill sets that are required if you really want to succeed at the highest level. That's why I knew I needed to go the top of the food chain of online marketers to get an understanding of what this actually takes. And it's important to note that while there are many hyped-up gurus out there, there are also genuine individuals that aren't just looking to extract money from you.
Unfortunately, Google has stopped delivering a lot of the information about what people are searching for to analytics providers, but you can use SEM Rush (or similar tools, such as SpyFu) on your own site to get a sense of the terms you’re ranking for and their estimated search volume. Google also makes a bit more of this data available in their free Webmaster Tools interface (if you haven’t set up an account, this is a very valuable SEO tool both for unearthing search query data and for diagnosing various technical SEO issues – more on Webmaster Tools set up here).
Going into network marketing? Understand that if you're not close to the top of the food chain there, your ability to generate any serious amount of income will be limited. Be wary of the hype and the sales pitches that get you thinking that it's going to work the other way. Simply understand that you're going to have to work hard no matter what you pick to do. Email marketing? Sure. You can do that. But you'll need a massive and very targeted list to make any dent.