Prestashop Default Theme Adjustments 3 -- 2

Hi, I need a few minor changes to be made to the default Prestashop version 1.5 theme. BUT DO NOT DISTURB THE CURRENT CATALOG OF PRODUCTS or CUSTOMER DETAILS - VERY IMPORTANT 1. Please copy and upload the site to a temporary server when changes our taking place. We DO NOT want the current website to be interrupted with changes. Once confirmed it can be uploaded to the official site. 2. Please insert the item code and “out of stock” option on the grid view. This is to appear when the admin ticks the “on sale” box in the admin back office.(see PDF attached). Please also make the minimum order automatically appear in the Quantity box. Currently only the number 1 appears. If no min quantity is set then 1 should appear. 3. Please also Make the “Out of Stock” Text appear on the single Item Page when the box is ticked. 4. Please remove a page form the checkout process and make the text changes as stated. Please see the attached PDF for more detail. 5. Please prevent the website from removing products from shopping cart if the browser is closed or the customer logs out. I will supply images and clearer instruction when the project is accepted. Thanks