You could take training accredited by professional bodies, like the Level 4 Certificate for Music Educators, offered by the Associated Board of the Royal Schools of Music (ABRSM) and Trinity College London.
The certificate course is aimed at people who are new to teaching music to children, and covers the purpose of music education and promotes best practice. It has been developed for:
- instrumental and vocal teachers working privately with schools
- primary teachers
- community musicians
- professional musicians who do educational work
Other options include training like the Instrumental Teaching Diploma offered by Rock School.