The employment of children and young person is stated in the Children and Young Persons (Employment Act) 1966. There will not be complication if you only employ persons who are not below the age of 16. Consult the Labour Department if you need more details.
KL Siew has put up a sister site by the name of mylabourlaw.net, which is in effect a more user-friendly version of the present popular pesaraonline.net. The site is in the process of being fine-tuned but it is fully functional. You are invited to visit the website at http://www.mylabourlaw.net and give your views or suggestions. Queries can be posted and be responded from there as usual.