If you are new to the world of Twitter, it can be very confusing. I started several months ago using the tool and learning about how to use it effectively. I'm still learning. Here are a couple of links that will get you started learning how it works, how to use it (and not to use it), and understanding how it can be used for your small business.

The beginner's guide to Twitter

A user's guide to Twittering

Twitter for Business

Here's my personal collection of bookmarks for all things Twitter.

That will get you started on your way to using Twitter as a tool for your small business.