LOL Darla... Okay here's what I think everyone should know...
Twittering is also called microblogging and it's a way to tell your friends what you're up to in 160 characters or less without all the formality and formatting, etc of long blog posts. It's easy to keep up with.
Add people as your friends and you'll be "following" them until they add you back. ie. They'll show up as a friend on YOUR twitter, but you'll show up as a follower on THEIR twitter until they add you back.
Twitter displays messages in a timeline format and will include all of your friends in that timeline display. To view it, access your main page and click the "with friends" tab and all of the messages from you and anyone you've chosen as a friend will be showed in the order they were posted.
Because of this timeline, it's almost like a giant chatroom where you can see and respond to your friends as you have the time throughout the day.
There are two ways to reply to your friends. Publicly and Privately.
To reply in public (a message you want all of your friends to see) type @username in your message posting box along with the rest of your message. The comment will be directed at that user and your post will be linked up to their twitter so people can follow along.
To reply in private (a message only the user will be able to see) visit their twitter and click the message link in their sidebar OR from your twitter, click home, then the direct messages link in your sidebar and the direct message tool will come up and you can select the username you want to send a message from in the dropdown menu and send them a message.
Other than that...twitter away and let us know if ya have any questions!
Robin