You need to have a plan for how much you are going to spend on your advertising efforts. Without such a plan, you are clearly going to have some trouble figuring out how you are going to successfully spend your money.
This is why the excel program that lets you create an advertising spending plan is exactly what is called for. If you have this, then you are in good shape to be able to craft an entire budget all around this one particular number. That is something that most business owners only dream of, but for you it can be a reality.