Recommendations to start with NG's books

I would personally advise you to read Neville’s books in this order:

    The Law and the Promise.
    The Power of Awareness.
    Feeling is the Secret.
    Prayer: The Art of Believing.
    At Your Command.
    Out Of This World.
    The Search.
    Your Faith is Your Fortune,
    Awakened Imagination.
    He Breaks the Shell.
    Resurrection.
    The Creative Use of Imagination.
    Seedtime and Harvest.
    He Dreams in Me.
    I know my father.

But, you can also read the books in the exact order in which he wrote them.
Some readers prefer this way because Neville was becoming more clear over the years, and perhaps it’s easier to understand him and his evolution of thought this way.

    “At Your Command.” 1939
    “Your Faith is Your Fortune.” 1941
    “Feeling is the Secret.” 1944
    “Prayer: The Art of Believing.” 1945
    “The Search.” 1946
    “The Power of Awareness.” 1952
    “Awakened Imagination.” 1954
    “The Creative Use of Imagination.” 1952
    “Seedtime and Harvest.” 1956
    “He Dreams in Me.”
    “I know my father.” 1960
    “Law and the Promise.” 1961
    “He Breaks the Shell.” 1964
    “Resurrection.” 1966