First Time DM Please help.

Hello all, my online friends recently showed interest in trying a DnD session and asked if I’d DM because out of the group I have the most “experience.” By that I mean I’ve watched Critical Role and have a very basic understanding of the rules. I already have a light outline for a campaign, so the thing I need help with is session 0.

What do I need from my players and how do I assist them in making character sheets?

What does a good session 0 ultimately look like?

Thank you in advance I’m incredibly excited to finally get into playing DnD after watching game play for a few years.