If only it were that easy. If only, I could just start a thread like this, and get a simple answer that tells me how to make an emulator and how easy it is, thinking I could do better than everyone else. It's just too good to be a dream.
I don't like living off of other people's work. I want to make my own emulator. I won't give up learning yet.
All I can say is, Google for some C++ tutorials, though you may want to learn C first. These are the usual programming languages used to make emulators, but there can be others. If you can't understand them, if you do not have the patience, the determination to push on and improve until one day you are capable of making your own, then the answer to this question is not for you.