The title post might be a little deceiving. I will actually tell you only one thing how to get lots of people to follow you which I am basing it on my experience. Try to search in Google for follow me follow you keywords. There are many results that will be given to you for sites that do these so you just have to sort through them one by one and check them out.
You do not have to check them all though, the first few results will get you something right away. Believe me, your email inbox will have lots of emails from Twitter that users are following you. The only requirement that follow you follow me sites in Twitter require you is that you really follow them for real. There are no worries if you think that they will unfollow you once you follow them. After all, there are Twitter tools where you can see who is not following you and you can unfollow them in just one click.
So go ahead and give it a try. Just remember, with you following lots of people, those whom you feel important to follow may not get through to you with their tweets because you will be seeing lots of tweet messages from other Twitter users that you followed.