My advice: get the guitar professionally set up. Especially with an acoustic guitar you want to make sure the action (distance between fretboard and strings) is not too high or else you will just hurt your fingers and make learning barre chords so impossibly hard that you will just give up. Learn all of the notes on the E string. In order they are E F G A B C D and back to E. The distance between each of these notes two frets, except for E/F and B/C where the distance is only one fret. Use the dots on the fretboard as visual cues (dot at third fret is G, dot at 5th is A etc, the two dots at the twelfth fret is E, but at a higher octave - the notes keep repeating)
Memorise the notes of each string (in standard tuning) from left to right (thick string to little string) it is E A D G B E. Learn how to tune a guitar by ear (very important: training your 'ear' is absolutely necessary to becoming a good guitarist and learning how to tune your guitar is the first step towards this).
Learn your basic open chord shapes (E/Em, C, D/Dm, G, F, A/Am) and then learn your E barre chord shape in both major and minor. These are moveable so once you know the shape you can move it up and down the fretboard and play every chord there is (E/F/F#/G/G# etc). Then learn the A barre shape in both minor and major. Finally learn basic chord progression theory and then your minor 7th, major 7th and dominant 7th chords to embellish your chord progressions with some flavour.
Seeing as you're starting on an acoustic I wouldn't dive too deep into scales straight away, instead I would save that for the electric guitar, but if you want to get into scales I would start with the C major scale purely for its importance in music theory.
I've written a few guitar lessons on my site that could be helpful to you, the most valuable ones to a beginner such as yourself would be the three part chord guide (1 - open chords, 2 - barre chords, and 3 - chord progressions).
http://endofthegame.net/guitar/
How much you want to learn really depends on what you want to achieve as a guitarist/musician. You could learn a few basic chords and strumming patterns and call it a day, but what would be the reward in that?