http://www.studybass.com
Is a great place to start, it has a lot of good articles and examples that will teach you what bass is all about and how to jump in and play.
When you have exhausted that I recommend drilling the major and minor scales, the blues scale and the major/minor pentatonic scales and then Major and minor chords (including 6, 7, and 9 chords).
Also be sure to start jamming with drum machine, and playing with people as soon as you can!
You might also want to check out
http://workshoplive.com
or
http://musicdojo.com
a lot of people here recommend them for cheap online lessons.