Justin's site is great...and that is how I started when I began to learn to play the acoustic guitar, 14 months ago.
I eventually wanted to learn songs that Justin didn't have on his site so I scoured YouTube and created a channel where I subscribed to the the best teachers I found:
http://www.youtube.com/user/rcadian
Feel free to browse through my subscriptions to see if any might be of help - I am not affiliated with any of them - they are just a big variety of acoustic guitar teachers or good players who I have learnt from over the past year.
Good luck learning...I've had so much fun since I began...
Rc