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Don't be afraid to let your players decide where to go next. Be adaptable, if they go where you don't expect them, have some back up flexible plan (or pull a random enemy out of the book and figure out how to spring it on them.)

Don't prep plots, prep situations. After learning that from the Alexandrian, prepping and running my prep became 1000 times easier.

1: Read the book. You will be the arbiter of the rules and knowing them makes your life much easier. 2: Don't assume mastery. You'll need a few runs with a system to get it down pat. 3: Have fun. Find a way to enjoy your time as GM. Storytelling, encounters, whatever works best for you!

Why? 1: I've tried to GM when I skimmed a book and it can be miserable. If you don't know a rule, you suddenly either A: need to spend GMing energy making a rule or B: Rummaging through the book and grind the game to a halt. Reading and understanding the book is good for you!

2: I once tried homebrewing 5e when I had just read the material but had done very little with it. It resulted in an interesting experience but ultimately unfun. But that's fine. Learning lessons through mistakes is just life! Just don't jump into the deep end at the start.

Engage all of the senses when describing what the characters are experiencing. Mention a little something about what they see, hear, touch, and smell -- maybe even taste. And then add in a little bit from beyond the typical five senses: chronoception, proprioception, or nociception.

I usually write down a list of sights, smells, etc. But man, you could abuse this advice hahaha. "As you walk into the chamber, the smell of charred bodies overwhelms you. The taste-" "Oh my god, you can stop there."

don't be afraid to take it easy and hand out pregens to players. Pregens are often simpler, and can help minimize questions directed at new GMs about characters. They really help with the growing pains associated with learning a new system. (I love pf2e's iconics for this so far).

Be honest with your players. If you need a minute to read up on a spell or a creature statline, or to think about a ruling or how to respond to something they did, just tell them and ask for their patience. They'll most likely be understanding. I've been GMing for 10 years and still do this.

Yeah, it's also just easier to look at them and go "hey give me a second here".

What I definitely do NOT recommend is just making a snap decision or trying to improv your way out of it. It works for some GMs and that's great, but in my experience, and especially for newer GMs, it causes more problems than it solves. Take your time and think it through.

Or have a snack / bathroom break while you look it up. That way they can take a few minutes too without an issue.

lol is it too greedy if i post my module meant to teach new GMs and players the game?

I would say since you asked, it's fine. It's also directly relevant to the prompt at hand.