Part 1
Nobody can quote you a cost per click
Your price comes out of an auction against whoever else wants that search, in your country, at that moment. The same keyword can cost two dollars in one city and thirty in another. Any quoted average is somebody else’s account, not yours.
Do this: Use Google Keyword Planner for a range on your own terms and country. Treat it as a range, not a price.
Part 2
The number that decides everything is what a customer is worth
A twelve dollar click is cheap when a customer is worth four thousand and ruinous when they are worth ninety. Cost per click on its own tells you nothing. Cost per click divided by conversion rate, compared to customer value, tells you whether the channel works.
Do this: Work out your average customer value and your conversion rate before you look at a single bid.
Halfway, and free
Part 3
Three costs, not one
The ad spend goes to Google. Management costs either an agency fee or somebody’s salary. And the landing page has to exist and be good, which is a real cost people leave out of the plan and then wonder why nothing converts.
Do this: Budget all three. A campaign with no budget for the page is a campaign that will underperform and you will not know why.
Part 4
The floor below which the channel cannot work
If your cost per click is twelve dollars and your conversion rate is two percent, one lead costs six hundred dollars before anybody is paid. A budget of a thousand a month buys you one or two leads, which is not a channel, it is a rounding error.
Do this: Do that division before you commit. If the answer is fewer than about ten leads a month, spend the money somewhere you can learn from it.
This is teaching material and our own reading of public documentation, not advice for your specific account. Check anything important with your own specialist before you act on it.