'How to start this unity project?

i have a project that i should made it with unity. The idea is that i have to do a 3d scene when player can pick up some object and can define a movement for each one. for exemple he can pick up a character and define two point and can define more points for another character. than when he click a button the two caracter will move following the line between this points.

I can write a simple script on how to make an object follow a path but this some the path and the object should be defined in playing mode.

Sorry for my english but i hope you can help me . thank you



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