1. You is the same as I.
Second: "As you approach the house, you see that someone has broken the lock. You push the door open and the noxious odor floods your nostrils."
First: "I approach the house. Someone has broken the lock, so I push the door open and the noxious odor floods my nostrils."
2. You write the narrative just as if the POV character is first person. You have to keep the "you" character's experience limited to what "you" can know.
3. You can write physical description easily and it comes with a confident tone: "You stare approvingly at your suntanned skin. You flex your muscles and pose as if you've just won the Mr. Universe title."
If you write from a second-person POV
it can be jarring,
so you need a good reason to use that approach.