Sales Order to Invoice Process

Hi

I am desperate for some help please.

I am struggling to work out if the company I work for is full of recalcitrant obnoxious people or people that only know their little bit. I seem to be constantly asking what the next step is and getting "Dunno, not my job" in response.

So before I go an bash my head into a pulp on a brick wall is there anyone on here that can walk me through the process step by step from a Sales Order arriving in the office, being put on GP13 and progressing through the warehouse and to invoice?

I also need the same walk through for returns and credit notes and how it all links together.

I am slowly going mad and really really need an idiots guide.

Thanks In Advance for any assistance.