I have never used scent.
The biggest thing would be ‘general’ scent training, then add sheds, but that is not set in stone.
Best to use a shed that has not been contaminated with too much human scent if you can.
‘Usually’ both sheds will be within a few hundred feet of each other, but one ‘may’ get carried off by a critter. Some get chewed on more than others for some reason.
I might be able to provide a shed if you do not have one to train with.