The following are moon phases and how to use them in spell casting as well as how to make moon water and what to use it for. I hope you get good use out of these. If you are interested in the moon you might also want to look into astrology as well. If you're interested, I have some links for that as well.
I think you can cast during the dark of the moon just as much as you can cast during any other phase. The moon technically never changes shape or size, so it's a form of symbolism. I have successfully used the symbolism of a dark moon before. (It's particularly nice if you want to curse someone secretly.)
All Witches are Lunar Witches, the Moon governs everything we do. All women follow the Lunar cycle just as the earth and the tides do.
When the moon is waxing, we do magick to increase or bring things to us.
When the Moon is waning, we do magick to get rid of things or banish bad habits etc.
The three days of the dark moon is usually a time of rest.
While the Sabbats are celebrated on the quarters and cross quarters of the year. The Esbats are celebrated on the phases of the Moon. Moon Festivals.
Here is a nice little poem to remember the phases.
"Bide by the Moon, follow her glow
By the light of the New, we renew and grow
By the waxing quarter, our determination shows
By the Full Moon's light, our desires we know.
By the Waning Quarter, we ebb after flow
By the dark Moon's presence we return what we've sown
Bide by the Moon, follow her glow."