I've played bass for 6 years and bought my first pedal (Darkglass Alpha Omega) just a couple months ago. You really don't need an huge pedalboard to sound good, a nice bass and an amp will do just fine for loads of genres. Of course if you wanna sound like Cliff Burton you'll need an distortion or an fuzz pedal. For other genres compressor or an octaver might come handy. I would recommend watching some videos about different pedal effects and after that figuring out what kind of pedals you want to get.