a few questions

[Stephanie]

Hi all,
I have a few questions which I need help with.
I not sure what the /relative is for?
Also, how do I make chords?
Here is a little code I'd written below, can some one let me know 
if I'm on the right track?
Steph

 \relative c {
 \clef treble
 \key c \major
 \time 4/4

} c4 do every from go from every do c4
 lower = \relative c {
 \clef bass
 \key c \major
 \time 4/4

} g3 from every do can do every from g1