Installing Wordpress Blog to my business webs

Hi,
I want an experienced developer who can help me in installing a WordPress blog to
my website in such a way that your blog will just look like my current website design.

where I can post Blogs, Articles,
Comments and customize the theme of the Blog.

This is solely meant for bringing more and more traffic to my website and publish posts about my website products.

The url must appear like www.mydomain.com/myblog/

Please let me know, how much time would it take to install such a blog.

Also, bid for a fair amount and mention exactly what all services would be included in your bid.

Best Regards,
James