(idiomatic) to make plans

後: a time after the present time

後に: subsequently, later on

later, afterwards, some time after the present

then / soon afterward; after that; thereafter

a surname / a place name

to stand, to place in an upright position / to release something physical but not solid or liquid / (Internet slang) to start (a thread)

travel, a trip, a journey, a voyage, a tour

a plan, planning, schedule, conception

to plan, to make a plan, to plot, to lay out