Wordpress help for ecommerce store.

Hello I operate an ecommerce store for mobile phones. Are there any plug ins for detailed product description and check out options? I need meta tags added. I need FAQs page to where you click on a question then it takes you to answer. I also want it so when people click a product it tells you people who viewed this item also viewed this
.etc.I also need detailed contact us section

Please add me on skype : vikasvyas47

I think you must check the list of Top 5 eCommerce Plugins for Wordpress based Websites :
http://technoupdates.org/top-ecommerce-plugins-for-wordpress

WooCommerce has been highly regarded, although it's only compatible with some themes.