The ratio of number of twitter accounts you are following and twitter account following you is very critical for your account. It is important that you maintain that ratio on ongoing basis. The tool that can help you to do that easily is crowdfireapp.com/

Suggestions:

1. This is not an ongoing strategy. You will get the best people to follow you by tweeting quality content. This strategy will work initially but once you have initial set of followers, rely on posting good quality content and engaging with thought leaders.

Instructions:

1. Login on http://www.crowdfireapp.com/
2. You will get the list of NonFollowers (Users you are following, who are not following you back). You should individually unfollow users who
   1. are not authority in your domain
   2. are not following you back
   3. stay inactive most of the time
   4. who’s content you do not like to read

k.