Start recording and releasing episodes, and you can come up with intro music later.
Having or not having intro music is up to you. I believe it creates a nice vibe, but, again, this is my personal preference. If intro music is what’s stopping you from starting, don’t let it. Start recording and releasing episodes, and you can come up with intro music later. As for how to create an intro song, you can hire this out to someone Fiverr, but I personally used GarageBand to create mine. Make sure that you are using copyright free music (they have this in GarageBand) or that you are getting your music/sound effects from a website that allows you to buy the license. I use Envato.