Prestashop - I need help to fix buggs/functions in Prestashop site, price, discount price, cart popup, out of stock problem

I am building a Prestashop right now but i have some buggs that need to be fixed. This project is most about the price function in Prestashop, i have some buggs and also want to add some functions. 1 - When i add products in the product page i get a cart popup window, "continue shopping or go to cart". I want that same window when i add products directly from the category page. 2- I want to add specific price to my grid in product page. Show old price, new price in red color and also the % or discount amount after the attribute name 3- Specific price in the category page is not working correctly. And if you try to add a combination for my product only the default combination will be added to the cart. I have removed the drop down and side cart from my page. Maby at has to do with that , i don´t know?. The only way to add more quantity or remove products to cart will be in my checkout page later. 4- I can add products that is out of stock, even if i have deny order when out of stock for that product. This is only on the category page. it works for the product page. I want to fix this and also add so when a combination is out of stock, show text "Slut" I have attached a file that describes the problems that i have. / Thanks