I recommend that you try not to use popup and popunder advertisements on your site. Those types of ads annoy users. Also, many of the companies that buy and sell those types of advertisements are shady. The popup/popunder industry is not very honest.
Also, many other reputable businesses will refuse to advertise on your website if you have popups or popunders.
I know that when I go to a site with popups or popunders I lose respect for that website and the business that manages it. Popups and popunders are essentially a way to force users to visit a website. That is not respectable at all.
My recommendation is to stick to publishing on-site ads, such as banners, text-link-ads, and contextual ads. You can also monetize your website by creating and selling your own product.
What do you think?