Good, this was helpful to you, I hope.
Where means literally geographically where. Lawyers have licenses granted by states, and political economies depenednt on where they choose to live.
What means literally what: hat services do you perform for which clients and how do you make money by charging for them?
With whom, means literally with whom: what is the network of people in and surrounding your practice that make it possible for you to serve clients and who help you find and be retained by the clients your income depends on serving.
How much means literally how much: how many clients can you serve at what prices in order to produce what income minus the expenses of serving which are your profits, which must be enough.
Why means not what is the story of your childhood, or what is your motivation, but literally why do you believe that providing these particular services to these clients will meet your material, intellectual, social and political needs, which means saying what those needs are and considering how they will be met.
It is not an objection that you haven't answered a single one of those questions: as you say, you haven't actually been through the exercise and it isn't time yet. More important, however, is your decision to take yourself out of the road altogether. You say you can't have a practice of your own and need to work for someone else first. Fine, of course. That's your way and you should journey on it. But in Planning Your Practice we plan actual practices, so you probably don't want to spend effort on it.