hey man!
first of all you should know that all these people here are making PBNs by buying domains which is quite costly but yes it pays in the future.
i have a good alternative to this problem, what i do is that i collect expired web 2.0 sites having good MOZ PA and MOZ page trust and then put niche related content on them. As they are already having good authority so they are bound to rank well.
Making a new blog is like working from the scratch which is very difficult job.
I use weebly, tumblr and blog spots to make PBNs myself.
Apart from that i make accounts on social sharing sites and blast them with social bookmarking. If you need my help, just PM me.