Francis, unfortunately, there will always be risk when dealing with running your own business. It cannot be avoided. But have confidence in yourself and determination in your intentions. Subscribe to James Brausch`s newsletter for a lot of great ideas and marketing tools. He also has some great software, but while you`re on a tight budget, at least sign up for the free information. Come to think of it, he has some trial softwares with a free download. Best of luck to you!
Personally, even if I am in the market for a product or service, I will never purchase anything that is promoted via pop-ups that annoy me. Try real marketing strategies if you feel your product is worth while. JamesBrausch.com has great ideas and tools for this. Making one sale via a pop up is not worth ruining the reputation of your business.
Sign up for James Brausch`s newsletter at http://www.jamesbrausch.com. His articles are full of extremely useful marketing ideas; the do`s and the don`ts. It should give you some guidance.
PS..you may want to look at your signature on your post. There are some typo`s there.
As Bobbie mentioned, I use glyphius software to increase the effectiveness of my google ads. The improvement has been notable. You may also want to check out Artemispro.com as this will even further the effectiveness of your site. Having the right tools to promote your site can be as important as the products or services you offer. Best of luck!