-You will be asked to fill out an I-94 card and a customs declaration form in the flight on way to your port of entry.
-There will be some counters where your fingerprints will be scanned and an officer will ask you for your passport, I-94 card, customs form and might also ask for your I-20.
-They will ask you basic questions like why are you here in the US and which university and how many years are you gonna be thr. -Then they will stamp the I-94 card with an approximate date as to when you should leave the US which will be after your duration of studies. They will staple the I-94 card on your passport and you need to keep it along with you always.
Thats it, there is nothing to worry about the POE, just have the documents with you in case they ask.
Regards
Siddharth