Eye to The Infinite by Aharon Rubin
Here is an authentic Jewish meditations workbook, with clear, systematic instructions, exploring these questions and MUCH more, enabling both layman and scholar to derive immediate benefit from a hands-on spiritual manual.
In over eighteen chapters (122 pages of paperback presentation), the author takes you through the how, why and when of Jewish meditation, and presents over a dozen life-changing meditation exercises adapted from the ancient, classical texts of Kabbalah and Jewish theology.
Available both in softcover [for $16] and as an eBook [for $13].