And it never came to your mind that you GOOGLE YOUR FREAKING QUESTION??? http://lmgtfy.com/?q=Wordpress+create+xml+sitemap Code (markup): The first thing you find is a plugin that does what you need.
There is a very good plugin for that, it'll automatically create sitemaps for you. its called google xml plugin
Hey, i found one video on youtube.com which is related to your query that, how to create sitemap on wordpress. Just go to youtube.com and type "How to create a sitemap page in Wordpress websites" Thanks...
You can easily create XML Sitemap through www-dot-xml-sitemaps-dot-com this tool . Please remove dot and use . on this url.
Its really easy..just need to download free plugin which will help you in creating XML sitemap and then just submit that to google and other serach engine of you want!!