Help finishing ZenCart website

Fix and finish almost comlete existing website [login to view URL] The main item that must be fixed are: The website must run faster The quantity must refresh and show the correct pricing The checkout must be streamlined and simple to use All payment gateways must be working properly The shipping we use is table rate and the shipping must be shown before checkout page Must speak english and be able talk by phone during this project Here is a list of the items we need help fixig...it will be easier to go over these by phone but this will help you quote If you have SEO experience and are willing to work on our SEO after the site is up and running that is a real plus General - Website run faster Home page - More Options include “Multi-Panel”, “Brush Marks”, “Custom Sizes” Simulation page Size on the wall changes when selecting other attributes (not suppose to happen) Attributes box - orientation symbols for Panorama and Landscape should not be the same Portrait and landscape should be the same dimensions (one is vertical other is horizontal) Panorama is longer than landscape Image on wall should change when selecting black/white and Sepia the image on the wall should change Color tab – change “Original” to “Color” Drop down sizes are not in sequential order Word “Finish” not left justified Back to shopping should take customer back to simulation page or home page Checkout page Move wording while waiting for checkout up to center of page Options wording should be in this order Orientation – Size - Color - Finish - Depth - Gallery Wrap - Free Photo Enchanced – Free The image should be shown in the orientation the customer selected Quantity does not work … if you change quantity the price disappears Remove Total items, Weight and Amount from top left Shipping is table rate based and should be listed somewhere appropriately Sub-Total should be moved to the right Check out should be simple and functional All forms of payment should be operational