Contract Manpower Hiring, Training and Retention in Manufacturing Company

Dear All,
Can you suggest and send me the procedure of Contractual Manpower Hiring, Training or Skill upgrading and retaining them.
All the company have some different procedure but I think the objective and desired result is same.
Please put your comments and send me something related for implementation.
Regards,
JP

Have a recognized man power supply contractor, who takes care of all statutory compliance in time, on behalf of the principle employer.