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Then you have a couple of strategic options with your landing or home page. You can play hardball and make the visitor sign up or leave. This sort of opt-in page has some information explaining the benefits of opting in and an opt-in box.
Or you can play softball and just make the opt-in prominent. This might be a good option if another goal of your homepage is to establish expertise or build a relationship. Allowing your visitor to browse a little before opting-in could be a very good strategy.