A six string guitar has six strings, tuned EADGBE. A twelve string has the same strings, except each string is accompanied with and octave string, with the exception of the high e. These two strings...
starting form the top of the guitar (known as the bottom) but thatll come later when you learn tabs The big string is the low E string represented by a capital E the second biggest is the a string...
steel wire wrapped in steel , nickle or copper depending on what you go with for the most part just steel wire with nickle wrapping it is the most common think Ernie Ball , certain Dean Markley or GHS