Well, it one of the easiest ways to start earning money online.
1.Setup a Free blog,
2. Register with Adsense
3. Place the ads on your blog
4. Write content
5. propagate the blog

STEP 1
you can setup a blog in Blogger (as I have done) and select a good topic for the blog. there can be 2 types, one time content blogs and continuous update blogs. If you don't have time each day but do know about something in detail, put it within different topics and make blog posts. for example, your blog can be a guide to various DIY things for the house. or making some home furniture, or some guide to a software. This type of blog may not receive a lot of hits but will get you a few hits over regularly, long after you have actually written the blog.

If you have the time and inclination to write regularly, you can attract a lot of regular readers which will definitely get more hits than a static blog. you can write about the work you do and the Industry you work in. May be help people find a career in that industry.

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