Having Multiple Sitemap's can affect your indexation and traffic. How to do it? structure your sitemaps by how deep your pages go and by section. Visit this site for more:http://www.seomoz.org/blog/multiple-xml-sitemaps-increased-indexation-and-traffic
Seomoz is such a best blog for all seo professionals from where they learn some new and advance seo techniques.
XML Sitemap will bring profit.. You should upload the text file to your server, generally to the highest-level directory you want search engines to crawl. Once you've created this file, you can submit it as a Sitemap.