So yeah. I'm planning to make a blog about crypto currency. I'm planning to add some few advertisement. So how? Or is it when after the blog has reach some certain hits or something?
it depends on the blog that you have. if it is a free blog, most of them don't let you put any advertisement of yourself on your own blog, and they put their own ads and take the money themselves too. some others like wordpress only let you put their ad and share the profit with you.
but google (blogger/.blogspot) lets you do whatever you want. the easiest network that pays bitcoin is a-ads
and here is the full list:
https://bitcointalk.org/index.php?topic=1108616