I setup a new site in November and added content at the start of December. My initial ranking strategy is use expired tumblrs, wordpress, yolasite, expired over-blog and some other new web 2.0s. I'm using keysearch.co and the difficulty is 18 and 19 for two variations of the keyword, after 4 weeks one keyword is on page 2 and the other is on page 4. I'm now thinking maybe add a couple of expired domains with part of the keyword in the domain name and build niche related blogs that are hosted. I have no idea how many pbn's needed to rank p1. I was thinking of doing the same with my other two websites.