How do you get twitter followers?
There are lots of ways. First of all if you have a web presence such as a website or blog, make sure you advertise your Twitter profile prominently. This can just be a simple text link like I use in my sidebar. For WordPress blogs you can take this a step further and use a widget to display your latest tweets.
If you don't have a web presence try some blog commenting but using your Twitter Profile as your link. Also insert your link into email or forum signatures if you use those. Another way to pick up a few followers is to just follow other people in your chosen area of interest.