This is a very common question.  There are a few resources at your disposal

• Read the Microsoft public newsgroups, especially microsoft.public.development.device.drivers
• Search the web, somebody has probably already asked your question
• Ask me ;) (but please don't email me, keep it public so that others can see the response)
• Join the NTDEV alias which is run by OSR

This list is far from definitive, but does offer a good starting point.