A minimum of 20 posts is reqiured in the first month of blogging. It is advisable for you to post them regularly instead of posting a lot i a single day. The post that you write should be unique and it should not be a copy from any sources that is available in the internet. It is neccessary for the search engines( mainly google) to recognise your post. You can see if your posts has been indexed or not by google by opening google.com, and write “site:http://your-site-name.com” in the search option. The number of results that come up is the number of your posts that had been indexed. The higher the number, the better it is. Let google index at least 20 of your posts before you start earning through blogging.
Exchange links with other people through forums. All webmaster forums have Link exchange categories. Exchange a minimum of 20 links with other good PR sites.