I'm not quite sure what you're looking for, but here is some basic information that I hope you'll find helpful.
Business rules in MDS work this way: You create a rule, configure its expression (If this condition exists, then take this action). Then you publish the rule, and finally you validate data against the rule. Here is the procedure for creating and publishing a rule:
http://msdn.microsoft.com/en-us/library/ff486985.aspx
And here are ways to validate your data:
http://msdn.microsoft.com/en-us/library/ff486977.aspx
http://msdn.microsoft.com/en-us/library/ff486953.aspx
If you import data into MDS by using staging, records are not automatically validated. You must use one of the procedures or use the web service to validate your records.
Suzanne Selhorn - MSFT