There is a problem that is often associated with FS users. It’s to do with where your eyes go when you’re flying. In FS you well find you fly the aircraft on instruments everywhere, in the real thing you HAVE to look outside. Basic flight should be easy for you but it is very important you do as much of the flying as you can with reference to the outside world.
99.9999% of the time the thing that’s going to kill you in an aircraft is outside the windscreen coming through it.
As for the headset, if you’re really keen on flying then it is a good investment, are you going through to CPL?
Good luck with the flying, students who put in the effort, read ahead, think about their flying are the ones who get through the fastest, cheapest, and generally become the better pilots.