New Industries and Cargos for OpenTTD
You can jump right into FIRS gameplay.
FIRS is available:
Many FIRS cargos are not transportable using the default OpenTTD vehicles.
Fortunately there are lots of great NewGRF vehicle sets with FIRS support.
The OpenTTD content service (Bananas) is a good place to find these.
FIRS offers 6 economies. The 'Basic' economies are simple and offer a good starting point for players new to FIRS. Other economies are more complex and challenging.
In addition to the economy parameter, FIRS provides a number of other parameters.
It's fine to leave these on the defaults, they're provided for advanced players who want to adjust certain aspects of FIRS gameplay.
When you begin a new OpenTTD game, FIRS will disable itself if certain conflicting newgrfs are detected.
You'll see a message if this happens.
There's a list of conflicting newgrfs.