There are numerous directories that Twitter users can use to increase the number of followers, including Twiends, WeFollow, and Twellow. Make sure you add yourself to as many of these directories as you can under the proper categories, and you should begin to see some users following you. Check out more tips from twiends.com/get-twitter-followers.
Suggest you follow people that tweet about things you are interested in. Comment on their tweets, engage in discussion with them. Lots of people do follow back. make your tweets interesting and/or funny.