interactive with object, that are animated to drop down

hey, does anybody of you can explain me how I can interact with animated object in game, so they are flying down, and you have to shoot them. Furthermore the objects have to randomly spawn on a straight line. How does this work? And another question, can I make the fortnite character inivsible, and replace it, with an other object? And can the character be locked, so he can only move to his left or rigth? Thank you very much