Well, all you basically need to learn is what note each fret is. Coming from violin that should not be too tricky although it will require more concentration initially. Check this:
http://www.cyberfret.com/first-fret/note-names/index.php
Oh, welcome to GN!
It's pretty basic.
Guitar music is written an octave higher than it sounds (so everything fits on the treble clef). That might mess with your ear a bit in the beginning.
The strings are also tuned 'backwards' from a violin - you've got GDAE, we've got EADGBE (lowest to highest). Mostly in fourths instead of fifths, with a major third between the 2nd & 3rd strings - that's to put the whole tuning in two octaves.
Every fret is one half step. I've written a couple articles in the Lessons section on reading in first position - I'll get to higher positions pretty soon.
Guitar teacher offering lessons in Plainfield IL
...you should check out the Tom Serb lessons in the beginners section - standard notation part #1 and #2 I think they are called. They do a good job explaining what the notes represent on the fret board - I found it very helpful.