A - A#/Bb - B - C - C#/Db - D - D#/Eb - E - F - F#/Gb - G - G#/Ab
Remember that the #/b notes are the same notes, and there name changes based on the key you are playing in. As it relates to the guitar, typically we refer to things moving in whole steps, or half steps.
Whole Step - 2 frets on the guitar
Half Step - 1 fret on the guitar
In relation to music, a half step moves from one note to another. A whole step moves 2 notes. For example, A to B is a whole step while B to C is a half step. You will notice that there are 12 notes, and that on the 12th fret of most guitars there are two dots. At the 12th fret you have moved up a whole octave and the notes start over. Here are all 6 strings and the notes located from the open string to the 12th fret. Notice how it always starts over at the 12th fret.
Moving in half steps (one fret at a time.)
E - F - F#/Gb - G - G#/Ab - A - A#/Bb - B - C - C#/Db - D - D#/Eb - E
A - A#/Bb - B - C - C#/Db - D - D#/Eb - E - F - F#/Gb - G - G#/Ab - A
D - D#/Eb - E - F - F#/Gb - G - G#/Ab - A - A#/Bb - B - C - C#/Db - D
G - G#/Ab - A - A#/Bb - B - C - C#/Db - D - D#/Eb - E - F - F#/Gb - G
B - C - C#/Db - D - D#/Eb - E - F - F#/Gb - G - G#/Ab - A - A#/Bb - B
E - F - F#/Gb - G - G#/Ab - A - A#/Bb - B - C - C#/Db - D - D#/Eb - E
To clarify this point, simply go up each string and say the note names a loud. Read from left to right, one string at a time. Once you feel comfortable, trying singing the notes out loud or finding where all the A's are, etc. I can not stress enough how important it is to know the notes on the neck of the guitar and hopefully this all makes sense in how I explained it. Let me know if not.
:D
Douglas Showalter