First, MIDI, to understand the concept and working principle of MIDI, that is, the basic knowledge and equipment of MIDI.
Second, music, the basic theory of music is absolutely essential, including music theory, music understanding ability, writing ability (orchestration, composition, arrangement, etc. )
Third, the ability to make and operate software, but also to understand the basic knowledge of audio.
MIDI music production is a comprehensive work, and it is easy to get started, but it requires strong abilities in all aspects to make good works.