One way user sync from one AD to another AD

I am pretty new to FIM & I want to know if there any step-by step instruction to achieve One way user sync between 2 active directores using FIM 2010. I need the users to get synchronized. When I creat a new user in one AD the same user should get replicated in other AD

This is what I intend to do.

Pull users from Forest A to Forest B. Its a 1 way Sync Forest A -----> Forest B.

Apreciate if i can get any help

regards

vadiraj