how could i create a through and effective workplace safety policy?

Answer 1

There are various on line resources, but essentially involve workers and management to identify the hazards and risks in your workplace, and then begin by developing policies that deal with them one on one. No magic her, just hard work, and attention to detail. Once that is done, pay someone to audit your workplace, as they will likely see dozens of hazards everyone just walks by, because all of you are used to them..

Answer 2

Thorough? That's alot. And I can't think of everything. But for step one, arm everyone. Sounds extreme, but it works.