osCommerce - Installtion and setup of Plugins / Community Add-Ons OSC

I require an experienced developer who has excellent knowledge of the OS Commerce system. A fresh installation of osCommerce Online Merchant v2.3. is live with a template that has been applied to it, as the content and images will be updated after the plugins are working. The type of scripts to be installed will cover the following areas: Meta Tags Google XML Sitemap Google Product Search Feed Discount Code Newsletter Sign Up and Email And also to make the bredcrumbs and URL pages use the same format and output. I’m open to suggestion on which the best suited community add-ons are to be used for the above areas.