As far as games/ROMs are concerned, you can rely on Google as well or use a dependable download source like Underground Gamer. Someone on the forums here might be able to give you some specific help or know the answer to your questions. If you are having trouble with anything, usually it’s a good place to try and get help.
Often the place where you download the emulator from has some instructions on how to proceed from here, a FAQ section or a forum. In this case there was the Wikipedia entry as well so you could follow a link to it’s official home page and download it from there. Once you know the name of the emulator you want (in this case, KEGA), you can Google for the emulator itself and download it. Download The Emulator & Some ROMs to Try Out KEGA also serves as an excellent all-in-one Sega emulator as it plays ROMs for the Sega Master System, Game Gear, Genesis/MegaDrive, Sega CD, and 32X without much hassle.
Gens has it’s own unique features but KEGA reportedly has more accurate sound and is slightly easier to use. I have done the work for you this time: the two best Genesis emulators are KEGA fusion and Gens.
Analogy aside, each of the basic steps in the process are common to most other console emulators you might want to try running in your PC. My intent with this article is teaching how to fish, but in this case, giving you the first fish for a practical demonstration.
Our resident emulation enthusiast, Ivo has volunteered to share a series of emulation guides that will focus on helping new retro gamers get started on their emulation journey.” While emulators may be a bit more work to set up and use than the original console, it lets curious gamers play around with the system without investing any financial resources. Note from racketboy: “For those starting out in the world of classic gaming, emulation is one of the first places people start out in order to get their feet wet. Sega Genesis/MegaDrive Emulation on Windows PC: KEGA Fusion