3D Fishing Lake

I am trying to create a simple 3D fishing game. The user can control a character in an environment and walk around a lake catching three different types of fish. The fish caught will be saved in inventory until the user decides to sell their fish for coin value. There will be three different types of fish in the game all with different coin values. The game should be built with Unity, C#, and a local database mySQL. For the projects Unity assets can be used