How do advertisers initially find your blog and how do they know how much traffic you get? In general, what makes an advertiser decide to use your blog for advertising?
Well I got 1 3 letter word for all of those questions "YOU". ~You need to create a page called "Advertise/Advertising/Advertise With Us~ ~You need to place your geo information for the potential advertiser to look at~ ~You need to come up with a price/plans~ So it's called "Media Kit/Advertising Kit" Checkout some sites and you'll see what it is exactly! Hope this helps.
Ultimately Mr.Swagga above is correct. You have to get out there and do stuff that gets noticed. There are probably 100,000 words on this site alone discussing which things are the best to do, but something is always better than nothing. One place I would suggest to start, is researching keywords. There are a number of keyword research tools out there, from free to costly. Search for keywords on topics that you want to write about. Then use the results design your articles so that the search engines will see them. Good luck to you. regards, Wayne