PHP Bug fixes to eCommerce shop

General information for the website: The site sells Furniture with Paypal, Cardsave and Finance payment methods.
Kind of development: Customization of existing website
Num. of web pages/modules: 3
Description of every page/module: We have a few errors on our website that we need to diagnose and fix, they are:

*Single option types do not carry through the correct information to our checkout page
*We need an already implemented coupon code system testing with any bugs fixing
*We need a small error fixing where if a hyphen is used within a product title, it does not break the link
Description of requirements/features: This is a basic online shop that we need bug fixes for before we redevelop the site in the next couple of months. We are needing the fixes done for Easter. More work will be needed on the site whilst we develop the new one so this could be more constant work as a result for the right person.
Payment methods: Paypal
Specific technologies required: PHP, HTML, CSS, JS/AJAX
Extra notes: We use a custom, but simple, CMS to power the shop.