>>97398534
Run phandelver, you pretty much just have to read the chapter a day in advance and you're set. More advanced GMing concepts are something you can look into, but for a complete beginner your best bet is to minimize prep and get premade dungeons, which is where the premade modules shine
>im new
Shit i nearly forgot, make sure you pirate it

I hope you get exposed and lose all your friends, frogfaggot.

>>97398534
As GM, present a situation with an obstacle in it, then players try something and you describe the reaction to that, using the rules as your guide for resolving things.
Thats 70% of GM'ing and once you (mostly) learn the rules its all flows fairly simply.
Try to know and apply the rules, but its better to make a quick ruling, write down what it was and correct it after the session is done then to slow the game down mid session with book reading.
(When presenting your situation, Be open too many possible solutions, your players WILL fail if you need them to read your mind and succeed on a singular specific solution)
As to not blot this post further, even though others may disagree, Your recommended reading will be looking up Deficient Master, The Alexandrian and Seth Skorkowsky for further fundamentals on GMing.

>>97398534
The good part is that they're all new so many mistakes you make are not going to be noticed.