ILS approaches....HOW??

Guys I have been flying the Flight Simulator for years but never really learn what ILS approach is. NOw that I had read it up but I still don't really understand how it works. I really need some guidence here, hoping those who are well-verserd can help me.
Firstly I use the GPS to navigate me to my desination, upon reaching the airport say 30NM away, what should I start to do?
Tune in to the VOR station at certain freqency?? on NAV1 or NAV2 ?? what are the steps?
How would I know am I heading the right ans straight approach to the runway??
I am really confused...Can you guys help me??
I been reading abt ILS, I am getting more and more confused everytime I read from diff website.. hah.
So I need to know VOR navigation before I can use ILS approach??
Thank You for spending time to read my prob.
Hope that you guys can teach me and giude me..
I would want to start off with the Cessna 172SP.
Thank you!!!
Firstly I use the GPS to navigate me to my desination, upon reaching the airport say 30NM away, what should I start to do?
Tune in to the VOR station at certain freqency?? on NAV1 or NAV2 ?? what are the steps?
How would I know am I heading the right ans straight approach to the runway??
I am really confused...Can you guys help me??
I been reading abt ILS, I am getting more and more confused everytime I read from diff website.. hah.
So I need to know VOR navigation before I can use ILS approach??
Thank You for spending time to read my prob.
Hope that you guys can teach me and giude me..
I would want to start off with the Cessna 172SP.
Thank you!!!