The October 2017 New Moon in Libra occurs at 3:12 PM EST on Thursday, October 19th, which is when the Moon also goes void-of-course (thanks, Moon). The Moon then enters Scorpio at 9:41 PM that same day. The good news is that the Moon is in Libra all day Wednesday October 18th, and it enters Libra at 1:35 PM on Tuesday October 17th. This information is also detailed in my Cosmic Concerns: October 2017 post if you’d like to see this information as a list.
That means you can do your New Moon ritual after 1:35 PM on the 17th, any time on the 18th, or before 3:12 PM on the 19th. For charging, you can leave items out on the night or either the 17th or the 18th, but if you wait until the night of the 19th they will be charged with Scorpio energy, rather than Libra energy.
The two week manifestation point for this New Moon is on Saturday, November 4th with the New Moon in Taurus. The six month manifestation point is on Sunday, March 31st 2018 with the Full Moon in Libra. The March 2018 Full Moon in Libra will actually be a Blue Moon, which is the name for the second Full Moon in a calendar month.
My guide, Witch’s Guide to New Moon Magick, can be found on the site here; this post is a companion to that guide. If you’re new to Moon magick that’s a great place to begin.