Making $1,000.00 per month from a blog can easily be done if you are prepared to work hard in the beginning with little to no pay.
If you work hard enough at the blog and pick the right niche and get traffic to it you can earn that $1,000.00 per month about 5 years after creating your blog. Or if you're extremely lucky you can make it sooner. But expect it to take awhile.
It won't happen overnight. Pick a high paying adsense niche that you know a lot about. Such as insurance, web hosting etc.
The higher the cpc the easier it will be to earn a good amount of money through Adsense or other ad networks.
Make sure you know what you're talking about when writing the blog though as people will dislike your blog if your information is wrong.
If you're unsure about the niche you can do research before you start writing the blog.
$1,000.00 per month is roughly $35.00 per day which is pretty easy to achieve if you work hard enough with your website and write your blog around a high paying niche.
Maybe make your blog on a variety of topics such as health, web hosting, finance, insurance, automobile insurance etc.
Those high paying niches will payout a good amount of money per click.