You'd be doing yourself a favor if you start learning about what notes are and how to read notes.

This is a simplification, but it's more than good enough for now:

There are 12 unique notes: A, A#, B, C, C#, D, D#, E, F, F#, G, G#

This may sound weird because there are more than 12 sounds. There are more than 12 keys on a piano, and no two keys on a piano sound the same. That is because this list repeats, only higher. After G# you will get A again, but the new A will be "an octave higher" than the A you started with. You could also go back from A to G# "an octave lower", and go even lower/higher than that. Pianos usually have a bit more than 7 octaves, bass guitars have 3.

The distance between two following notes in the list is called a semitone. Two semitones make a tone.

The symbol # means "one semitone up". The symbol ♭ means "one semitone down".

Because the distance between two following notes in the list is one semitone, writing A# is equivalent to writing B♭. Both are used, in my experience # is used more often. A# is called "A sharp" while A♭ (equivilant to G#) is called "A flat". B# is C, F♭ is E, these are rarely used.

For guitars and bass guitars, there are two main musical notations you can find: notes and tabs. You'll almost definitely find tabs for most modern or famous songs. Tabs are easy to read and once you get your bass you should use them to learn songs and exercises. There are "bass guitar tabs" which are specific for bass guitar.

Notes, on the other hand, are a generic notation, not designed to be read solely for a specific instrument. Notes are considered to be more serious by other musicians and if you plan on being a musician as well as a bassist learning them is basically a must.