What you need
Camera with a wide-angle lens, with a maximum aperture of f4.
To see a large part of the Milky Way together with some landscape, you need a lens with a shorter focal length, e.g. 14 mm. You can get reasonably cheap 14mm lenses with aperture 2.8 with manual focus for most cameras, it will be fine for most people to start with. The typical zoom lens that comes with cameras is mostly not very useful because it cannot zoom out enough to capture a large area of the sky.