Welcome to the emulator, and debugger! Here are some resources that might help and get you started on making Atari 2600 games.
The below is some code that I found helpful to use as an example to start off of. It is by no means correct or useful for any use. The example program allows you to use the player 1 joystick controls (arrow keys) to move an H around the screen.
If you want to run your game locally, I recommend using the Stella Emulator. It includes a very powerful debugger and has greater fidelity than this online emulator.
On success the output will be colored like this, otherwise it will be colored like this and you should read the error messages. The console will also be turned off.