ok. firstly, is your bass a passive or active bass? passive electronics do not require a battery. if there is a battery slot on the back of that bass, it's an active bass.
next thing i need to know is how many pickups are there?
if there is only one pickup, it might be an active bass. the first knob controls volume, the second controls the bass, the next controls the treble.
if there are two pickups, the 3 knobs might be set up like this:
(1)
volume
pan pot mix (balances the neck and bridge pickup)
tone
(2)
neck pickup volume
bridge pickup volume
tone
to produce a double bass like sound, pluck from the neck. above the last few frets. use the neck pickup and set the tone so that it sounds 'muffled'. you could also adjust the eq on your amp to boost a little bass and decrease the mids. use the treble to control your clarity.
to go even further, you could use flatwound strings but maybe that'll be a bit extreme esp if ur juz a beginner.
hope it'll help?