Emulation of old PC games

[James]

I wanna play games like the first King's Quest, Leisure Suit Larry, Monkey Island, and possibly others. These older games don't seem to fall under "roms," because I haven't seen any rom sites that support these older games.

So, where do you find them, and how easy is it to set them up and play them on your computer? I imagine you install them and run an .exe that goes into DOS, right?