You're both right. The gentleman at the music store already gave me a sort of "lesson"

by letting me watch how he formed his mouth, where he placed it, and where he blew to create the solid tone.
I spent some time this evening and got to the point where I could play up and down the scale on one of the dizi's

.
They're actually rather nice instruments.

The jade makes for a beautiful flute. The one is very Chinese (which means it is likely not going to conform to everyone's tastes), with its dragon and phoenix metal ornamentation, but there is an advantage to the metal band, which, though glued into place, broke free easily and slid down to cover the membrane hole. (I scraped the remaining glue off with my fingernail.) It moved the dragon figurine on the metal band away from the side of my mouth, where it was abrading my face and lip.
As you indicated, my goal will be long tones up and down the scale for some time with these instruments, until I can get to the point where I know where to place my mouth, how to shape it, and where to blow the air to get the proper sound up and down the scale.
If I get to the point where I can play in the base register, I may consider trying some lessons if I can find a party skilled in playing the simple system flute on a thick walled instrument, rather than the standard Boehm system instructor.
Thanks to everyone who took the time to respond.