Modify Wordpress Site

The site to be modified is http://www.judesmid.com. It's a Wordpress / Woo e-commerce site that uses as template Blanco, but it is completely modified to past requirements. The last points that i need fixed are: - pretty url needs to be implemented eg.. ([login to view URL] --> now it's with numbers etc and it doesn't look professional). - shift the size + quantity columns above the 'add to shopping bag' button (for example; a ring buyers cannot add to the shopping bag without choosing the size, but size column is out of the screen...). - report errors in check out page to the customer (red alert when customers fill in a fake address or not complete fill in the check out page). - the site has to be mobile friendly (tablets / mobile phones). Now it shows too big + not mobile friendly. - inventory product codes (interactive), we need product codes with the products that will also automatically show on the product page on the website, invoice and bookkeeping form. Which allows us to keep track of everything sold. - more professional receipt, buying notification + selling notification (now it's a low key message, a few lines and looks poor). - 'sale' picture is not working (uploaded jpeg). This is when things are for sale or sold out, that we can put a notification picture. - disable the shipping cost calculator, but keep it present in the program (as we will sell our products including shipping costs).