To get the basics of the bass isn't that hard, main difficulty will be aching hands and fingertips for a while. Use a tab site (there are plenty) and learn to play a few things with tab, keeps things interesting in the beginning , and then you can have a go at theory.
Rock/metal mainly, Finger Eleven, Incubus, SoaD, 311, might get some lessons
Get some lessons so you don't start with too many bad habits, and it should help speed up the technical side of playing the bassic guitar, and take it from there.