You should try a combination of reputable companies to give you the best result. Please take a look at adtoll.com as a choice of company. We pay by paypal, you can set your own pricing and offer 75% commissions plus a generous affiliate program. We also accept ebullion as payment for ads, and soon epassport. We offer a variety of formats, including text, banner and video.
Instant acceptance, Bidvertiser. Bidvertiser is averaging me about 0.20$ per click on one of my sites, and I have been paid via Paypal. Second link in my signature.
Well, if you're new to this, you may want to try a combination of CPM and PPC networks. CPM is a metric that pays on ad views, no matter if the user clicks the ad or not. You can try a network at www.freedomofads.com/register We pay via PayPal with an 90% revenue share.
I signed up for freedom of ads, and bidvertizer. I will probably ditch bidvertizer as I heard bad things about them.