I want the draw length measured at the front of the riser and that is also where I want the weight to be measured from.
Like others, when I order a bow, I always asks where he measures the draw length and weight.
As for brace height, I measure it from the bowstring to the deepest part of the grip (throat). I also ask the bowyer where he measures brace height too so there are no mistakes.
Speaking of draw length. If you're by yourself and want to know what your draw lenght is, get a large washer with a hole in it, slip it over the front of the arrow shaft till it's about halfway down the arrow out in front of the riser. Draw the arrow to your anchor point and while you're doing this, the arrow will slide up against the front of the riser and sit there. Then slowly let down and see where the washer is. That's your draw length.