Etiquette coach needed (Bokeelia)

I would like to hire an etiquette coach for my 18-year-old son.
He's already well-behaved and amiable, but I want him to know both the fundamentals and specificities of polite society.
If this is right for you, please reply with a description of yourself and convince me why you would be right for this.
If you have any links to anything online that would convince me further, please send that.