Greetings from Redmond!
The number #1 question I get asked is "How can I quickly setup FIM self-service password reset?"
The first item you will need to do is go through the deploying FIM 2010 R2 checklist of requirements, before you begin and setting up the FIM Sync and FIM Portal components:
If you want to do a quick proof-of-concept the SSPR quick start tool will be useful:
If you want all the steps involved or if the quick start tool is not sufficient then follow the FIM R2 SSPR Deployment Guide:
Another helpful SSPR link is the FIM 2010 R2 SSPR Resources Wiki