I like this post on YoungsterInc about 'How to Make some Money as a Youngster Blogger?'
It is written for youngster, but I think it will apply to you. At the end of the day, it is not really about making, it is about how many people you help, then the money would come.
Some tips from YoungsterInc are:
1) Choose a niche (specific) topic that you are absolutely passionate about to discuss on your blog. The narrower the topic, the better it would be.
Setup up multiple blogs if you are have different interest. Don’t try to do too much on one blog.
2) Write really really good article on your blog(s). Articles that can truly help people. If you are very very good content, readers will pass it along to their friends. Word of mouth marketing is the most effective marketing on the planet.
3) Identify and research other blogs that focuses on the same topics. If you think their blog is pretty good, you can do one for of the following:
Review:
Youngster Inc. » Blog Archive » How to Make some Money as a Youngster Blogger?
Good luck!