A domino effect or chain reaction is the cumulative effect produced when one event sets off a chain of similar events.1 The term is best known as a mechanical effect and is used as an analogy to a falling row of dominoes. It typically refers to a linked sequence of events where the time between successive events is relatively small. [emphasis mine]
Like the child's game, if nothing sets off the first domino, nothing happens. However, the first domino falling onto its next in line can provoke a series of reactions, quite often creating a more serious reaction and so on...a type of:
1.2A series of events, each caused by the previous one.
definition 1.2A in Lexico
The other suggestion might be
He who punches first, punches twice
satisfies the part of the question as I understand it:
The Chinese phrase that conveys the meaning perfectly is 有了第一次就会有第二次, which literally translates to "If there's the first time, there will be a second time".