Your question is not clear? Whether you want to use the ad network as an advertiser or as a publisher. Pricing for advertisers and publishers can be different. You also do not clearly state what kind of ads do you want to buy or publish on your site. the rate also depends on the type of ads. If you want to advertise, I think CPM is the best modality.
Ad cost depends on various factors, but generally speaking the rates are cheaper if you want to target to the tier 3 countries compared to the rates for tier 1 countries. Tier one countries means the US, the UK, Canada, Australia. Tier two countries are France, Italy, Brazil etc and tier 3 countries are India, Pakistan, etc.
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