Not being faecetious - but learn to get the instrument in tune - get an electronic tuner and use it.
Once, that's there, listen to some of your favourite music and just play along anything at all - playing your bass will help you identify what the bass player on the recrding is doing - listen for notes of the same pitch as yours plays. then, try to find the same notes he or she plays, and where they are on YOUR bass.
This should give you an ear for where the stuff you're interested in is in terms of the sound of the notes.
But remember no instrument is easy to play well, but perhaps bass is the easiest to start on.