In reality, having a blog is not something for everyone. Sorry, but if you need someone else to write your post, it's a very good clue that you're not fit to have one.
If you pay someone else to take care of your blog, then you should invest your money somewhere else.
I see so many blog with one or two post. Others with a post 6 months ago. And others with one post full of banners.
Please, you must understand that having a blog is a responsibility. You need to feed it if you want it to grow. You need to take care of it if you don't want it to die of starvation.
Save a blog today!
And if you think that you can wrote a minimum of 3 post per week, then do it.
If you keep writing and learning. You'll end up with a blog that will help people on the web. There's a need for good blog on the web. Just do it!