Hi losting, I think this is sound advice from @ian61and @bass_dinger. Personally I would try and get a grip of the basics before trying to play with others, and a teacher does help.
In your situation I would buy a modestly priced decent quality second hand bass, there are many on FB / ebay and start playing along with your favourite tracks at home.
I spent my first year watching and playing along with videos on YT, I didn't even buy an amp! The best thing I did is find a good teacher online, you progress so much faster.
The electronics side of it is interesting, some good advice on here about self builds, speaker cabs
Have fun
J