I wouldnt put thank you for reading the advertisement, and also agree you should try to put across that you are a business and not a person.
e.g. instead of...
I personally work to the highest quality at the most competitive cost. I am regular, reliable and provide free quotes. Local references available on request.
I would put...
We offer a regular and reliable service and at a very competitive price, call now for and free quote and see for yourself!
reference
"Mrs Lyle: I am very please with the services provided by frazerKleen, they are on time professional and curtious, with and excellent standard of work, at an unbeatable price".
When I started I asked some of my customers to fill out a feedback questionnaire with a disclaimer saying any comments maybe used as a reference on promotional media, then used the comments as shown above. It worked well and the customers were fine with it, I asked three custies, and just picked two I liked.