OK, maybe stupid question. There are a lot of defined email templates here. Are (many of) these live and will happen as defined, or does each one need to be wired to a trigger? What does the "Using Custom Template" mean on each row?
The built in templates are sort of a combined trigger + template -- you don't need a custom trigger for those. Things like booking confirmation for direct bookings, payment receipts, etc will be sent out when that event occurs.
"Using Custom Template" means you have overridden the default template for that email.