You would have to familiarize yourself with musical theory and study the common rules and conventions around music composition.
You would at the same time have to learn to play an instrument. Composers typically use a piano for composition because the piano's eight-octave range is bigger than that of other instruments, and because it offers more harmonic and contrapuntal possibilities on a single instrument than any other. Knowing how to play the piano would also enable you to compose music in the vast majority of DOWs (digital audio workstations) which use a virtual piano as their input method and can be easily used with MIDI Keyboards.
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