Hello!
As someone who's been playing bass since 1997, I can tell you all of the resources linked above are valuable and can help you learn a lot, although only Justin teaches like Justin.
However, be aware that huge communities (such as the Talkbass.com forum) may be a bit confusing for a complete beginner.
And with so many different sources, it may be best to just pick one and stick with that only for a while.
Also, there are hundreds of different styles and techniques: don't feel compelled to learn all of them unless you want to be a 360 degrees versatile bass player.
Start with the basics and once you got that, choose a path you like.