I go alomg with Amos about a first instrument-Spend your budget on a good second hand rather than a 'New'guitar for the same money.When i started I already knew songs I wanted to sing with guitar rather than unaccompanied,so a guitar playing friend(who helped me get my first guitar as well)drew the basic chord shapes in six keys-C,D,E,F,G and A.The basic chords were the C Am F G G7 series in each key,working on the principle that with those I would play any thing I wanted to.To relieve the boredom of just playing chords I used to sing Paul Anka's Diana in each key_thats what the chords fit easiest.It might not work for you but it worked for me.Best of luck any way.