New bassist here

Hey, my name is Damian and I've always loved music, every kind, but specifically rock (any subgenre). 

Since my birthday is next month, I asked my father for an electric bass so I can start making my own music and experimenting. I also write lyrics and all that stuff, but I've thinking about changing my stile into something more punk rock instead of indie rock. 

I also like the idea of math rock but idk if that could fit with punk

I have several questions. How do I start a band? Do I write first the lyrics or should I create the base in first place? Is Amazon a good site to buy my bass? Where can I publish my music? 

And much more but I've forgotten. Once I have my bass I'm doing more of these.

Also this is my first time in there after 9 months and idk how to use this

Thanks!!