Scales are very important.
The most important thing though is that you know how EACH one of em sounds before you play it.
I can tell the difference between mixolydian and ionian, between aeolian and dorian, between phrygian and locrian. However I still didn't learn where the roots, 3rds, 5ths, and 7ths are in every scale.
The scales required to play jazz are: The major scale and its modes, the melodic minor and its modes, harmonic minor, diminished, augmented, and wholetone. Its also important to know maj7, min7, dom7, and min7b5 arpeggios all over the neck.
I use lots of books.
THey include :
The complete jazz guitar method by Jody Fisher.
Jazz Skills - Jody Fisher.
Guitar Chords Encyclopedia - Alfred
Jazz Chops - Buck Brown
The Real Book
Guitar Chords - Joe Pass
and various songbooks.
Vids include:
Scott Henderson - Melodic Phrasing, Jazz Improvisation. Eric Johnson, Joe Pass - Hot Licks, John Petrucci - Rock Discipline, Van Halen guitar method, and many many concerts.