Found this really simple and straight forward guide to calling the Bing Map API. It describes how to do basic mapping, how to add pins, polygons and so on:
If you have an old Bing Map page and want to breathe a little life into it, have a look at:
it covers the versions of the Bing Map Control, and details what new features were available in each one, and how to call them; great to give you a hand converting to later version calls. Some changes to calls made by your code may be needed, but this should make it easy.