Useful stuff:
For a detailed guide to obtaining an API Key more information can be found here: Google Developers
Need to find a postcode or address of somewhere? This handy website allows you to easily find this information by dragging a marker to a desired point on a Google map. http://ctrlq.org/maps/address/
If you need the longitude and latitude of a point you can try out this site: www.findlatitudeandlongitude.com