Contact a professional fight choreographer, they will be able to help you find, use, and teach your cast how to safely work with stage weapons. This is really the only answer we can give you as working with weapons can cause serious injury and death. The internet is no substitute for real hands on training conducted by a professional. This may be a little more expensive than what you might be hoping for, but the safety of the people involved in your production is worth a lot more than the cost of professional training.