You can build targeted lists right from the bat, by targeting each of your traffic sources to different squeeze pages. Or you can build a general mailing list, and then email to it about your sub-lists so you can grow them from there. Those are two strategies you can consider when it comes to building several targeted lists on which to build your business upon. Personally, I feel building tightly segregated lists from the off is the best way to go about it.
For example, if you build a squeeze page specifically targeted to football bettors instead of sports bettors and you send traffic to that page, it will mailing list convert better. If you have designed your traffic generation sources such that only people who are interested in football betting come in, you will build a list faster, and your list will be much more targeted as well.
More people will respond to your emails, and overall you will just make more money by using this strategy. So consider segregating your lists or targeting your list building efforts to more targeted demographics. Fabian Tan is a well-known Internet Marketing expert and the author of the popular 45-page Report: For an Internet business, having an online mailing list is a vital process for creating predictable profits like clockwork.