Need a few changes on existing modified oscommerce website (add facebook button, add call me back button, change sorting on product listing, ... )

Hi, For this website i need a couple of changes. I want to bill by the hour and after each step, you can make an invoice. [login to view URL] Changes are: -add a like box -add a call me back button that sends an e-mail to the owner of the website -change default number of products in the productlisting -add related products from the subcategories on the screen when choosing a main category. Has white space now. [login to view URL] -... A couple of other things might need changing too. Let me know if you're able to work on this this week and mabye next week. You'll need to use the time tracking feature of freelancer and make invoices. Thanks