Hi Qaiser,
I can deliver what you need. I've been a writer for a handful of years now, writing about pretty much everything under the sun, most of which I had no clue about before starting the project. I'm used to researching topics I have no knowledge of, it's pretty much how I got my Business degree.
I keep my content as down to Earth and as unique as possible, forgoing this trend of regurgitated copy that I see all over the place. I'm new to this site, as I just signed up, but I do have a website (complete with portfolio) which you can find at www.WarmCupofCopy.com.
To answer your questions:
1) I do have SEO content experience, both for a fitness site and a property firm. The former was my own website, the latter was a recent client who had me make SEO content in both articles and site copy. I had the site on the front page of google for many local search terms.
2) I have dabbled primarily with Wordpress, my site is powered on it as are most of the other sites I've worked with/for. I understand how to create articles and such, but I wouldn't be much help in terms of coding.
3) Property, tech, gaming, memoirs. I have written in a variety of niches that I have barely a clue about, again forcing me to go deep into research.
4) I am more than happy to write a sample.
I hope you read this and, who knows, maybe we can work together.
All the best,
Joe