1:- Go to some freelance sites to discover what is out there and what types of services people are in need of. and design.
2:- Decide what skills you have that is most marketable. You may choose a few related skills to start with if you have the time. The new breed of freelancing and project-oriented sites let companies needing help describe their projects. Then the freelancers and small businesses offer bids or ideas or proposals from which those buyers can choose.
3:- Make a business plan and stick to your goals. Start off small then advance when you feel comfortable. Your income will start off slow but will improve with hard work and determination.
4:- Remember earning a income on the internet is not easy and nothing will ever happen if you do not take action. There is no free money on the internet, it always involves some work.