Here are some graphic aids to help planning things easier:
General Sizes of Beach Landing Zones
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Two Up, One Reserve
Generally, this is used for:
2 Platoons Up, One Reserve
2 Companies, Up, One Reserve
In this scheme, the two "up" units land in the first wave, with the reserve unit landing in the second wave, some 3 to 12 minutes later.
Landing in Column
This formation reduces congestion and is useful for landing on a limited beach or under conditions of reduced visibility. Since this formation subjects each unit successively to concentrated enemy fires, the time interval between waves is reduced as much as possible without congesting landing craft and intermingling units on the beach. This time interval should be from 3 to 6 minutes.