There are various ways where you can work at home. You can register in various outsourcing sites
that are legitimate. A few of the list includes odesk, elance, freelancer, guru and vworker. You can work various jobs here like being a virtual assistant, content writer, programmer, tech support, web designing and the list goes on.
The outsourcing sites I mentioned are legitimate, so you don't need to worry about getting scammed. If you wish not to register in these sites, just be careful about scam sites.