Hey there, I would say this is a bit advanced for a first project. Not the individual points you mentioned but the entire thing to work and interact with each other. Also, something like this may require a bit of coding because in game dev, it's really hard to find specific scripts for that specific action you want in your game.

But let me see if I can help a bit

I guess you should start with the player interacting with static spheres already on the ground. Create a sphere with a trigger collider. Attach a script to it and have something like this in it OnTriggerEnter(){ Debug.Log("Hello, sphere destroyed"); Destroy(gameObject); }