I don't do videos. Someone else's perhaps.
The stem is the central vein of a leaf. I assume you are referring to the stalk end.
For the first question, it doesn't matter about the binder. It can come from the same leaf as the wrapper, and just be flipped so that the "upper" surface is facing you, or you can use a matching leaf half for the binder.
I begin a cigar roll by placing the wrapper's leaf tip closest to me ("bottom" surface exposed), with the outer margin of the leaf forming the visible outer edge of the wrapper (rather than having the stem--vein--edge visible on the finished cigar). I begin with the foot of the bound bunch lying on the wrapper's tip, and then roll the cigar away from me, toward the head.
It turns out that the direction of the roll of the binder doesn't usually matter with the direction of the roll of the wrapper.
Set the new mold aside, until you have learned to roll smokable cigars by hand. The mold is a cosmetic appliance that may just complicate things. If a cigar won't smoke, then it doesn't matter how nice it looks.
Bob