Do you have any materials on sight music reading?
No, my materials focus on guitar theory. This includes learning and applying scales, chords, progressions, modes and more, but not studying standard notation.
Learning how to read standard sheet music
Learning how to read standard sheet music is a great step in any guitar players musical development. There are many suitable methods out there that focus on learning the treble clef, reading notes, and counting rhythms.
A few of the oldest and most common courses include Mel Bay's Modern Guitar Method Grade 1 and Hal Leonard Guitar Method Book 1. I recommend getting the books that include CDs. This way you can hear each example and then play along to practice.
Beginner level guitar books like the ones above begin with teaching players how to read music from scratch. You may not be a beginner player, but you still need to start at the beginning in order to develop the sight-reading skill.
If you can just make it through a book or two, then you'll be able to identify basic notes, key signatures, whole notes, half notes, quarter notes, and eight notes. And you'll understand how to follow the form of a song (repeats, 1st and 2nd endings, coda, etc.).
In most cases, the guitar player doesn't need to be an expert reader (like a piano player). Very basic reading skills is still an asset and suits most performance situations.
Beginner Guitar Players
I recommend that guitar newcomers interested in popular music first focus on how to play rather than how to read. More on this topic here:
http://guitar-music-theory.com/forum/viewtopic.php?f=7&t=54
Play Until Yer Fingers Bleed!
Mr. Desi Serna (Google me!)
http://www.Guitar-Music-Theory.com
Scales, Chords, Progressions, and More