“Racing” is by no means required for great use of TR. There are many others here that don’t race, but use TR for general fitness or keeping up with friends in group rides. So you are in good company.
I would suggest using the Calendar, adding the events you know (again they don’t have to be races, any event is fine) and use the new Plan Builder to lay out the training plan for you.
If you are new to training and indoor training in particular, lean towards the lesser time, lower volume approach, since trainer work is much more focused and intense than most equal time outside.