Most important thing is to have fun. Of course, you will need a good quality guitar that will stay in tune (hope the one you have fits that bill). An acoustic guitar isn't the best thing for a beginner though. An electric guitar is much easier on the fingers because it doesn't take as much effort to fret the notes. Not to mention you can get all kinds of sounds out of an electric with just a Line 6 Guitar Port for your computer or a small modeling amp.
As far as learning some technique, if you have some money to put into your learning, you might want to check out iPerform3D. Here is the website....http://guitarschool.net/ It utilizes a 3D computer model of a guitar and guitarist and you can zoom and view the playing from any angle. Its much better than watching an instructional DVD because you can control the camera with your mouse.
Here's a screenshot.....
I just remembered. When and if you find yourself interested in playing an electric guitar, you should check out http://www.rondomusic.com . They have a product line known as Agile guitars. They are near clones of famous guitars (namely the Gibson Les Paul) and are top notch quality. My stepson owns one and it is a great instrument. They aren't very expensive either. A top of the line Les Paul copy goes for around $400 when the real thing will cost you about $4000.