From your question, it appears you are a complete newbie.. There is a long learning cycle in front of you.. Anyhow, It must be fun trying to explain soo basic..
- You must first get your model (coin) ready, complete with rigidbody (To respond to gravity). Usually Blender or somethign should work, but in yoru case, a unity "Cylinder" should be adequate)
- create your basic scene, a plane (or terrain) on which your coin can fall
- Either statically place lots of your coins at a height (this will need no scripting to make the coins fall. You just have to start the game.)(OR)
- Create a manager (An empty Object will do) and add a script to it to instantiate the coin at preset or random positions beyond a given height, and watch them fall down.
Collecting them.. is a different story altogether. You need to get deeper into scripting and the unity API calls. Depending on what exactly you want, it could be anywhere from a few lines to a few files. Happy Learning!!!
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