There are many stories about how startups have succeeded because of blogs are amazing.

Starting with 37Signals, who launched BaseCamp with their blog as it boasted tens of thousands of subscribers. Or Wufoo, doing it in a similar manner of only having a blog first. Buffer did the same. So now that you've spent some time creating a blog, make sure you leverage it for two main purposes: more exposure to press/guest blogs and a resource for your audience.