Posting content is irrelevant to the process. Google must find your website to index it. The easiest way to do this is to make sure it is linked to from some other website that is indexed by Google. Otherwise, you can use Google's form for submitting your website.
If you are part of a blog network, you shouldn't have to worry at all as the network will provide links to your content.
Once your main page is indexed, Google has an avenue to find the rest of your content.