How much should you spend on advertising?
Generally the rule of thumb is to test and measure... Ask yourself this.... If you found a source of advertising that paid you $10,000 for every $1000 spent, how much would you throw at it?
Absolutely - test and measure.
But perhaps you're on the wrong track
"The price of being unremarkable is advertising."
So how can you make yourself more remarkable so that word-of-mouth (still the best form of introduction) can happen? Check out the Gaddie Pitch as a way to articulate this.