さあ、計画を始めよう。

come; come now; come along; go on; hurry up; well; who knows; I don't know...; uh; hmm; well now; let's see; there we go; all right; about that; you see

plan; project; schedule; scheme; program; programme

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to start; to begin; to commence; to initiate; to originate; to open (e.g. a store); to start up; to establish (business. etc.); to start ...; to begin to ...