could you pls send business senirois in T and L,finance
AdamRoue is right, there's an entire career worth of answers out there for you.
Another place to check, for those who stumble on this forum, would be the APQC Process Flows built into the business process modeler for LCS. I think it's interesting to see what they think business do and give a sample approach to a process for working. If LCS and BPM sounds like Greek to you, just check out any one of 100 blogs about it all over the place.