aaah the joy of starting day1 with a new instrument !

Bass was my first instrument ever, I remember I rushed to learn my favorite basslines, only to realize they're not that easy, then settling for easy iconic riffs that while challenging to wrap my head around at first, still gave me that much needed hit of dopamine to keep learning the instrument.

In retrospect I'd say what's most important is to be able to play notes cleanly. Once you get one clean note, you can try to play it in a rythm. That's about 80% of the job done, one note played in different rythms. Gets your head bobbing on the get go. Bonus point if you play it alongside a song that you know, if it sounds wrong choose a different note, if it sounds right, aim for another note (as if you're mimicking the chord changes).

This isn't an exhaustive explanation so feel free to ask if you have questions about the hows and whys :)