Learning easy to play beginner guitar songs as soon as possible is one of the best things you can do to help you learn the guitar and advance your guitar skills. Why? Because when you start learning the guitar, you'll need to get your hands used to the specialties of playing. Your fingers need to get used to the strings, forming chords, and so on.
To get your hands used to the guitar, you'll need to practice a lot, but if you just do practice drills all the time, you'll quickly get bored of the guitar. I've seen this with lot of people, but it's logical actually. Most people pick up the guitar because they want to make real music, not just do drills up and down a scale for example.
This is where songs come in, and the earlier, the better.