Can someone help a beginner?

I am a complete beginner, and I have searched the answer hub. However, the answers mention things I do not know how to do, like lighting, and several blueprint nodes that I do not know how to use. I am mainly making a game as an exercise of sorts. I just want to make a game where you collect coins, and the game ends when you get all of them. My problems are:

When I press play, the coin actor disappears and the game does not start off from the camera’s view. I have to right click the camera and select the option to do so.

The coin actor remains black even though I dragged a gold material into the details panel for the actor. The details panel says it is using the gold material.

I am able to make the coin disappear upon contact, but I cannot create a coin collection system.

Here is what I have right now.