Rusthenge new gm

Do I need to do any real prep work outside of reading the campaign story and chapters? We just finished the beginner box and I feel like I still have so much to learn. We are all new to pf2e, or ttrpgs in general. Like I noticed how they have a map with things to interact (like stores, locations of interests being labelled A2 and stuff, etc)? Are the scenes the only scenes I'll need, or will I have to make my own scenes for certain encounters? How would I implement rations and sleep? What if my party wants to do something I don't have anything setup for? Like kill bandits? I know it's a lot to ask, but I wanna be a good gm and it's honestly overwhelming to be unsure of so much, if anyone knows a good video on a campaign played by a group on YouTube I'd love to give that a watch to grow as a gm. Thank you.