Content for customer blogs

Information for the blog/website: Information is mixed depending on Client we have Car Rental, Florists, Kitchen Companies, Manufacturers, other retailers
Topic: Various Topics
Tone: Informal/Casual
Outline & Structure: I am looking to start off with some articles for our car rental blog. The blog should have a mix of

1) Tourism related Information (like Festivals that are coming up in the next month)
2) Car rental related some promotional information about offers or products
3) Some suggested tours & routes
4) Maybe some funny stories or you tube links about cars and driving and travel

Tone will vary dependent on the above

I am looking to start off with about 6 per month
Extra notes: I am looking for some one who writes with a complete native english style. This is the most important factor.
The articles must be unique adn informative,
The articles are mainly being written for business generation purposes and to link in with our SEO efforts.
We will agree topics for each month in advance.

The selected writer will have to sign a standard non disclosure agreement.