I assume you are saying that some agencies or instructors do not sufficiently cover the subject in open water class? When I did my first drift dive, it worked just like the OW manual (and instructor) said it would. Nothing to it, really... There are some minor differences based on location. In Florida, every op I've used has required buddy pairs to carry a flag. In Mexico, buddy pairs were to inflate SMB during safety stops. In Honduras it was neither. In all cases, they provided these things if you didn't have one. It's the sort of thing that they tell you about during the ride out to the dive site.
Personally I think it's the easiest kind of diving.. You jump off the boat and you surface when you're done. The boat follows you so you don't even have to navigate.