I'm starting a new project and I'm trying to decide where to put complex method code (business rules?) as a standard for myself.

Can somebody help me with some best practices - pro's and con's of what I should do, and the problems I will run into down the line if I do it any particular way?

My concerns include embedded methods or external prg's, pathing of project components ( common (big )libraries or small local copies ) and benefits of loading a COM server once versus loading ( opening files ? ) once per transaction ( not for performance, but from a design point of view )

thanks

mike