Dear Cindru,
I endorse Shaik Abdul Khadir's (SAK) views. I am not clear about the objectives. Is the aim to train staff or keep the trainining department members occupied, to justify their salries?
Even taking the scenario that you have given, let me ask you further questions to ponder over. How large is your training hall? What facilities do you have? How many hours a month will the 500 staff be released for training? Will there be facilities offered for the staff to practice what they have learnt when they get back to their work?
Have you got all the training material prepared? If not do you appreciate the number of hours of preparation work required per one hour of training session?
As an ex-Industrial Engineering Manager and a Learning and Teaching Fellow of an Unversity, i can keep on asking you questions without giving you an answer. As SAK has siad, there are so many questions unanswered and areas not covered, it is not possible to give a definitive answer. I am sorry.
Finally, may I know what is your role?