You can find more twitter terms here.
Once you get the hang of twitter on the web you can download a (free) twitter app for your phone. This is pretty much how I became obsessed. But I enjoy being about to see what other people are doing and talk to real people during the day.
I hope this little tutorial helps! If you have any questions feel free to ask me.. Im not an expert but I can try and help ya. Oh and if you do set up a twitter account be sure to add me 😉