I have a WordPress website and am considering doing paid advertising on Google. I assume that for about 20 cents per click I could drive traffic to my site. I use Google Analytics but do not yet have Heat Maps configured.
My site has a "Buy Now" button. How do I measure the success rate of those ads in terms of sales of my app? I can not get any bit of sales data from Apple. Must I presume that a visitor coming from a Google Ad who clicks Buy Now is a conversion? Or there a concrete way to know if they purchased the app?
What are the general price ranges for paid advertising?