Virtuemart tasks, Joomla Website

I have a few small tasks that i need help with, regarding ViruteMart in my Joomla website. I DO NOT WANT A NEW WEBSITE, NO NEW TEMPLATE APPLIED TO MY WEBSITE, NO OPTIMISING FOR MOBILE. 1. Checkout function is not working correctly, returns errors such as "500 Layout bs2-edit_address not found" and "0 Call to a member function CustomsFieldCartDisplay() on null". I need this to be fixed so the Checkout system works. 2. I would like price/kg removed from my product display, and just display 1 price, the base price. 3. The virtuemart homepage has no formatting currently and looks unprofessional, i would like for this to be tidied up. ( I DO NOT WANT A TEMPLATE APPLIED TO THE WHOLE WEBSITE) 4. I would also like, once the checkout has been completed, for the user to be re-directed to a new page, where they can fill in a form (The products being sold are virtual products, and this will be the point they enter their data, to receive a Credit Check or AML etc. response) £50 is rough price.