Magento XML Sitemap for Google

I Have an install of Magento and wordpress. I need to make a sitemap in .xml that will also have my wordpress pages. I need someone to make one. This project is pretty open to the following A - make a sitemap only B - make a sitemap with an admin area to administer new pages. C - make a script to output automatically new pages and posts. Please choose ABor C for which option you wish to provide. please state how you can help . I am interested in SEO services too.