Hi, 
Based on what information your template should be different ? 
If there is no such precise information, i suggest you add it and in Create function, check its value and call the approprioate template. 
something like this : here i consider that the field has Selection signature.

if field_value == 'dentist' : 
     Call template = self.env.ref('module.your template_name')
     send your template

elif field_value == 'lawyer' : 
     Call lawyer_template = self.env.ref('module.your lawyer_template _name')
     send your lawyer_template .

and so on..
Upvote if this helps.

Regards.