Minimig uses a VGA port to be able to connect standard modern monitors. As FaLLeNOnE says, you can set it to either use a 15KHz mode (in which it functions just like the Amiga's 23-pin video port, except in a 15-pin form factor; you'll need a rare 15KHz-capable VGA monitor to use this setting) or 31KHz mode (which functions like a scandoubler plugged into the Amiga's 23-pin port; most modern monitors will work with this setting).
To use Amiga PAL modes, your monitor needs to be capable of displaying 50Hz signals. Many LCD screens these days don't go below 56Hz, so check the specifications before you buy.