Perform various tasks on a live zencart site

I have got a Zen Cart version 1.3.8 running and I need some repairs, changes and upgrades done. Following are the details: - Compare zencart 1.3.8 with our current install. And move any changes in original code to override file. As described in [login to view URL] - Upgrade the webshop to 1.3.9 - Fix the ZenCart discount / coupon codes. Currently not working correctly. - Install the German language, add language icon. Make sure all missing German translations are filled with English equivalents - Add Germany as a separate shipping zone. If shipping more than 3 items then € 10 shipping costs. (details to be determined) - Add a secondary type of shipping. Registered mail via DPD / TNT. Adjust terms and conditions accordingly, where people should be made aware of the risks of sending without registration. - Logged in as admin when sending out emails. Make sure the language is based on the country of origin (or the language the customer has originally ordered in). Default: English, if Netherlands dan Dutch, if Germany/Austria/Switzerland then German. - Add a new payment type: Collect on delivery COD - Install a new commercial template (we have a list of favourites) - Enlarge Next en Previous buttons in product listing. Now its quite hard to click on them - Add blog functionality in the form of a plugin or integrate with an existing WordPress installation (will be done by me) - Enhance email templates in terms of information. Take a look at emails from [login to view URL] en [login to view URL] - Add a discount action: Buy 2 products's and get 10% discount. You get 16 different skirts! - New Products ... modify they query so it will only display skirts which are available in stock. Do realize each of our skirts is unique (one-of-a-kind), so when a customer buys a skirts, that particular products is gone. - Add an email validity check - Add a house number check - And some other small things - Test Test Test!