Hello,
to start you can try reading a thread from this forum - http://social.technet.microsoft.com/Forums/zh/ilm2/thread/2a431461-0f81-46e2-b4c4-a8d31ecbad59.
Some other useful links are:
http://technet.microsoft.com/en-us/library/ee534894(v=ws.10).aspx
http://technet.microsoft.com/en-us/library/gg418599(v=ws.10).aspx
You will probably end up coding the connector using FIM CM Provision API, but as Brian wrote in the above referenced thread, this part of FIM CM is not well documented, and from my own experience the "try and see" approach works best here.
Piotr