FIFA Regulations on the Status and Transfer of Players
FIFA Guide to Submitting a Minors Application – this is the guide that explains the each exception to the general prohibition of minors and also application process and supporting documents that need to be submitted with the application
https://digitalhub.fifa.com/m/2130eb84c31cf4e4/original/lb2t6bqgmi2a1x1pr5xs-pdf.pdf
FIFA Video – explaining regulatory regime on the international transfer of minors
https://www.youtube.com/watch?v=GrhyjblixXE
FIFA Football Agent Regulations
https://digitalhub.fifa.com/m/1e7b741fa0fae779/original/FIFA-Football-Agent-Regulations.pdf