Content Is King
If you own a blog you must have atleast 100 articles by yourself, it will make your blog rich in content and useful to readers to take a seat in your blog.
Old Wine Taste Fine
Any blog must be older than 3 months to take part in search engines fully, so build your blog at this 3 months period then prepare to see the money from your blog.
Choose a perfect Advertising method
Even i struggle in this part, choosing a advertiser to put ads in your blog is the main method of your income from blog, so you must be keen and up to the point when choosing this.
Google Adsense is the leading advertiser in this field (all cant have them, neither do I)
Chitika the second in the field
Bidvertiser 3rd but some times 4th because of adbrid.