This is the basic workflow I followed when color grading a recent short film. I hope this is found helpful in anyway!
Editor is to create a new simplified timeline specifically for color. Place all video tracks on one track as much as possible.
Have an exported reference file of the picture lock to make sure the import into DaVinci was done properly.
Export XML or EDL out of editing software
Receive hard drive with all of the raw files, editing project file (just in case), the exported project reference file, and the XML or EDL.