Perhaps this goes without saying, but unless you have lots and lots of traffic to your website, you won't make much money selling advertising. How do you get traffic? This is a complex topic, but mainly three ways:
- Search Rankings. Get highly ranked on the search engines for your keywords. In part, you achieve this by step 2… Links. Get links and recommendations to your website from other sites, blogs, social media, directories, etc. Ads. Pay for advertising to get people to your site — so they'll see the advertising there.
If you were to try to sell advertising directly, one of the first questions their media buyers will ask you is: What is your monthly number of unique visitors or pageviews? Unless you have healthy numbers, they won't pursue you. Get the traffic and you may begin to attract interested advertisers.
if you are trying to sell ads space directly. then provide all the vital matrices like page rank, Alexa rank, unique page view per day. types of visitors coming from, source of traffic. your highly placed keywords, and not to forget your rates for each ad zone.
Google analytics and state-counters are two commonly used analytical tools most bloggers used to collect all these types of matrices.