Seema, you must start at the beginning. Read through this post. Follow every link, and pay special attention to the link to the post from Wes on scams.
In addition, data entry is a flooded category, so you will have to present a great profile and proposals to be viewed. If your other skills are excellent, I would use a less crowded field. If you are looking for money right away, freelancing is not likely to provide. There are expenses, and it will likely take you, or any new freelancer, many proposals before you are hired.
