Planning is a process of setting a track for achieving the desired result by collecting all the resources that is required to reach the result. The resources can be money, equipment, manpower, books, software, skills, etc. The best way to start any thing is by planning the best possible way to reach the desired goal. We know " Well begun is half done". If we have a proper path, then its easy to travel than to search for things at the last moment.
Now, the second thing is to start on the set path. We may find many other options as we start but we need to make the best possible path and start the journey or else, the plan will just be on paper/mind but the goal will be far away without a movement.
As the writer has mentioned, we need to make movement and take the necessary step in order to get to the set goal. The plan can be reorientate as we advance and find better option than we had at start.
Unless and until a journey is started, we can't reach the destination and the ability to start is the start of reaching or achieving the set goal.
“Each day provides its own gifts.” —Marcus Aurelius