I just got my first bass so I am starting from ground zero. What should I learn and practice first in order to make the best progress possible.
Get a instructional book. One of those ones that comes with a CD. Those help alot.
^ i agree and work on finger speed and coordination of both hands and learn some damn theory!!!
Quote by R_H_C_P
You're joking right?

It's like comparing sex to sticking your penis in a blender.

Work on your left hand stuff as well as your right hand. Get some tabs you like and learn them. Since your a newb, with the bass you also have to get good at plucking, unless you're a noob and use a pick.

note: difference between NEWB and NOOB. A newb is someone who is new; a noob is someone who is not necessarily new, but is just an idiot regardless.