The map tells you of available connections when you start it.
No rail connection at all??? Quite rare, look at other squares you may want to grab 1 with a connection
Adapt, airport dlc, clearly good option
Make sure your main enterance HW connection is boss, cause it will be busy depending on import / export levels
And having a tighter than normal attention to import / export levels
Focus of well educated services, ie offices for jobs.
Get pop for rail/ship hub
Internal frieght will still look after yo, plug in air/sea port when you get it
Internal rail ring could be paired or shuttle to the intercity bus station