Need help from DND players!!

hey!! I don't play DND, but I've wanted to play for god knows how long. I've been wanting to make a homebrew session that takes place in my friend's favorite show (Supernatural) for her birthday. IDK where to start though!! DX

Any advice from seasoned DND players is appreciated! I need to know what edition of DND I should get, what resources I need, how I should plan a storyline, and how stuff like NPCs and classes work... my IMs are also open if anybody wants to talk there abt it

A great way to get your players invested is with maps. If you are playing your sessions in person, I suggest you make some maps on dnd/rpg websites and print them out at home or at the library or somewhere. And if you are doing it online, then you can download your maps and put them into the website you're playing on. If that makes sense.