Learning to use poedit

There is an application that is gettext-ready and that we want to translate using poedit. There is a working installation of poedit, but none of us in the company knows how to use it. Is there a brief tutorial or can someone explain how to use this application? If there is no .po file, should one be created? Is the .po file the only file that has to be edited?

Thanks in advance

EDIT: Overlooked the fairly extensive help file that is included in poedit. Problem solved.