Prayer for Beginners: What is the Best Practice for Newcomers to Mystical Christianity?

A reader writes,

I am emailing to ask you what particular practice of prayer you would suggest to someone starting out on the mystical path?

I have a little experience of Zen sitting meditation and have tried to practice with the Jesus Prayer. There are differences between Centering Prayer (Keating) and Christian Meditation (Main). What do you suggest I s…