These are extra items you can get for your guitar. If you are just starting out you may want to wait on some of these.

Electric Tuner

Although this is not an essential I highly recommend it. When you change your strings while they are stretching you may have to tune your guitar several times. If you are playing with more than one guitar you can make sure they are both tuned exactly the same. If you like to play rock and alternative music a lot of people drop tunig and it makes it really easy. Two years ago I bought my Quick Tune chromatic tuner for 30$. They may be cheaper now. It tunes electric(you plug the guitar into the tuner) acoustic(by a mike) and also does bass guitars. There are nicer ones, but Quick Tune gets the job done for me.

Distortion pedal

The distortion pedal connects between the guitar and the amp. It takes the same kind of cord used to plug the guitar directly into the amp, so an extra cord is needed. They are fun, but if you are just learning you should really concentrate on getting the basics down. And unlike many other guitar accessories, they have not come down in price. I have a Danelectro distortion pedal. The actual unit I have is the Fab Tone pedal. One advantage of the Danelectro pedals are they are medal. When you are stomping up and down on a pedal(you turn them on with your foot) you want them to last. Roland has some good pedals also. Distortion pedals do just that, distort the sound. They are a lot of fun. Note: Make sure if you want your pedal to last, you don't get a plastic one.

More to come, I am trying to get this page up as quickly as possible, and I hope to expand later.