The second stage will get the rocket into a parking orbit, shoot the rocket into a trans-lunar injection and optionally put the rocket into a lunar orbit. The boosters can be ignited before the first stage fires its engine(s) to get to orbit.
It is also viable, and advised to add a pair of boosters that run out of fuel first to be staged with side separators (see figure 2). Have some fuel tanks, but not too much (6 wide or more is recommended). It should contain at least 1 high-thrust engine ( Hawk Engine, Titan Engine or Frontier engine). This stage will, or should carry the rocket to closely achieve orbit around Earth.
A Moon rocket should consist of at least 3 stages: Building a Moon rocket is quite simple compared to building longer-range rockets.
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