Windows Filtering Platform Callout Drivers - Samples, Tutorials, Help
OSR (here) is a good resource for information and has some useful tools. The CodeProject (here) has several good series on WDM and WDF drivers with code.
Since the WFP seems to be for Win2k8, Vista, or better, you can use WDF - when you see references to UMDF (user mode) and KMDF, (kernel mode) this is what they are talking about. Using those acronyms may make googling easier.
Using WDF will make things easier.
Do any testing in a virtual machine.
you can read Driver Development tutorial and write a simple driver. There are the best tutorials I have read.