under 18 years old aplication visa to accompany a parent during bussiness trip

hello my boss would like to take his 15 ys old son to accompany him on a bussiness trip (the son is to learn the bussiness and meet suppliers),and im having some problems:
what should be filled in form?what otehr documents are requierd?
current occupation?
education?
purpose of visit( i understand most be tourisem for under 18 yrs old)
intended number of entries?
information of inviter in china?(i only have the suppliers letter- bussines), thank you so much!!!