change menu bar, check plug ins

i need to update changes for sidebar ( ajax filter plug ins are not being inserted in side bar, they are going into the body of page, need to fix so they go in body)
need to make sure production site is working properly/local site ( what to make sure are files are being process correctly for future updating of site)
functionality for proceed to checkout button not working ( when button is pressed, not proceeding to next page)
need to verify site is viewing correctly in browser (site should be viewing the same on all pages)
need to make sure there are no graphical issues with site, out of alignment improper place of icons etc ( need to make sure menu bar is on single line, and there is no loose images, words on page)
need to make sure email is working (not sending)
numerical quantity not updating on checkout page ( currently value is static)

This is a nopcommerce site, Must know ASP.NET MVC