Looking for help and assistance with PHP & JavaScript (and MySQL)

HI,
I’ve taken on some design work for an existing website and have completed the HTML and CSS without problem. To complete the job requires coding skills with PHP, MySQL and JavaScript which are beyond my basic skills.

Looking for a skilled individual to advise me here. (I may need to hire someone to code the solution for me.)

As an example of the help I need check out [http://silverwolf.co.uk/nutribom/products01.html]. I need my customer to select a number of products that are packed and dispatched into boxes of 4 products. Customer then goes onto pay for selection of one or more boxes. There will be further coding requirements elsewhere on the site.,