You are very vague in your description.
I got the impression that you need someone to provide ideas to you?
For $40 I will provide you with ways to build your PR business. I have lots of experience building up businesses both on and offline.
What you need at the start is not someone to help you blog, but someone to direct you in what to blog about, how often, who your audience is, research your competition, know where you want your business to go.
If you have already established all of this and you specifically need someone just for blogging purposes, I can do that at a rate of $20 per blog post (average post is 400 words). I am not saying I will be the cheapest, but gone are the days on the Internet of "content is king". People are now drawn to professionalism and "hearing from the experts". I have lots of experience in PR and worked in the Media since 2009. I have been called by some of my peers "an inspiration to the world of business consulting". Best of luck choosing someone, I'd be happy to elaborate on my experiences.
cheers
laura