Virtuemart Web site modification's

We have Joomla 3 - Virtuemart 3 website. We need this modifications: 1. Create simple user registration fields (First & Second name, Email and phone number) 2. Remove back button from VM product page 3. Close X button is not visible when you add product to the cart (on top right corner) 4. VM Cart - Some fields should be autofilled and hidden so that it is simple MSG and Button "Order". 5. Order email - simple layout (mostly many things should be hidden as sku, price,...fully hidden).