How to spawn objects

HI guys , so im begginer and im trying to create a endless runner game, im watching a playlist from one guy, and is great. But For my game I need to have scenery on both sides of the game (left and right side) and when walking spawn buildings. I don’t know if you understand, but I need help and I can pay whoever helps me (obviously not a very large amount). This is the playlist I follow Creating a MOBILE Endless Runner Platformer Game With Unreal Engine 4 - For Beginners! - YouTube, if anyone can help me please. Thank U comuunity.