|Keep the phone ringing|
A really important habit I had while running my lawn care business was to ask every single person that rang where they got my number from.
By doing this, and making a note of it, I was able to determine where I was wasting my money and where I should spend more with respect to advertising.
I discovered that my online Yellow Pages listing was a waste of money, and I cancelled it saving myself a lot of money each month. I also found out what worked the best for me too... flyers in letterboxes and my website. (More on all that another day.)
The same goes for every other area of your business. If you measure it, you can improve it.