An employer must first determine how many people will need to be on the team so that all locations and shifts can be adequately covered. Then you must determine what level you wish to train them to (i.e., first aider/CPR/AED, first responders, EMT) and who can provide that training (e.g., the American Red Cross). Next, determine how the team will be equipped (e.g., a central location for all equipment and supplies, each team member will be given their own kit, etc.)
Then, schedule occasional drills which address those accidents that can be reasonably foreseen occurring at the facility. Solicit cooperation from the local ambulance service, EMTs, or emergency responders, and request their assistance for ideas on supplies, equipment, number of team members, level of training, etc.