If you're serious about making money online, start a blog. Blogging is one of the easiest and most sustainable income sources. As long as the blog is setup the right way, in the right niche, with the right content targeted at the right audience, and the offer is complementary to the content, you could make a tremendous amount of passive income from a blog.

Samples. You’ll need some samples before you can really begin marketing yourself. Figure out which market you want to approach first, and then find or create some related samples. For instance, if you want to try your hand at blogging, study some successful blogs, and then write a few posts of your own to use as samples. Do this for any and every market you’d want to write for.

Job Boards. When you’re first starting out, you’ll have to go looking for work, and the best place to do that is on one of the online job boards. Places like  Fiverr, Elance, Freelancer, and oDesk are today’s writers’ best friends. They allow individuals and businesses to post projects, and freelancers to bid on them. Take a look around the sites, sign up for the free access in the beginning, and then begin to place bids on the projects that interest you. It will take some trial and error to find your groove, but once you do, the jobs will start to roll in.
The best part is that people who use bed and breakfasts are more likely to pay more for the experience. The challenge is that there’s a lot of competition in this field, so if you think earning money this way is right for you, you’ll have to set up your home in a way that makes for a memorable experience for guests. Here’s a checklist to get you started:
However, with online employment comes fraudulent companies who scam job seekers into signing illegitimate offers. "There is currently a 61-to-1 scam ratio among work-at-home job leads on the internet — that is, for every legitimate job, there are 61 scams," says Christine Durst, cofounder of RatRaceRebellion.com and consultant to the FBI on internet scam. 

6. IZEA – IZEA works in addition to a blog or on its own. You get paid to blog, tweet, take photos and take videos. The pay is mostly based on your following, so if you want to make money with your tweets, you’ll need to grow you Twitter following.  Likewise, if you want to make money with blogs, you’ll need substantial blog traffic (more on blogging below).