I have found that the white Signo pen does an awesome job of writing on dark cardstock. It is a highly recommended item for doing so.
I don't know of black glitter glue with gold flecks, however, the Stickles brand glitter glue is awesome!
Stamping takes a lot of practice to obtain the desired effect. One tip is to apply the ink to the stamp and not the stamp directly on top of the ink pad.
Also, I have used white chalk inks on dark cardstock with good results. I'm sure others can tell you of a better way to go if there is one, but I use white Tsukineko chalk ink and like the results.