Very broad question. Every campaign will have a learning period once you first start it. The rule of thumb is to start with max clicks with manual CPC (or max conv. with few target keywords, if your budget is huge) , but if you have the budget I’d suggest letting it run on max clicks till you get a handful of leads.
Curious, why are you running GAds for an emergency or immediate service? Maybe I don’t understand the industry but wouldn’t they call emergency services? Please correct my confusion if I’m wrong, haha.