Where can I get commanly used hand signals used to direct heavy duty trucks into a work zone?

I need to know what the common hand signals are to direct trucks, such as a gomaco or gravel truck into and out of a construction zone. For example, turnaround, back in, bear left or right. The signals a trucker may use to inform the flagger of what he is doing or what a flagger or spot person would use to direct truck drivers etc. I am a flagger and direct common traffic. I do this mostly with a stop/slow sign and occasionally with simple hand signals like stop. I am also responsible for directing the trucks entering and leaving the work zone. I understand this is a spot persons responsibility not mine, but since I started a month ago I have been the only one responsible. No one has showed me what the hand signals are even though they use them to alert me and they expect me to know and use them as well. I have asked my foreman for help also some crew members but I have gotten limited feedback. The construction zone is busy and dangerous and without previous experience I find myself second guessing and making mistakes. I can't find anything online. It's a good paying and great opportunity which I don't want to lose. Can you provide some information or point me in the right direction Thanks I greatly appreciate it.