Wordpress module for courier shipping

Hi there,

I'd like to build a Wordpress plugin that does exactly what this website does:
http://www.vancourier.co.uk/get-a-quote.html

- UK post codes
- Pickup locations listing
- Drop locations listing
- Van selection
- Contact details for dispatch and receiver
- Payment via Paypal or Card.

Something that can help:
http://www.enlightenmental.com/news-blog/calculate-distance-using-javascript-and-google-maps-to-create-a-realtime-quote-based-on-distance/

Thank you