Hi babymelody31,
Welcome to SaleHoo! Glad to have you on board :)
Here are a few suppliers for security guard uniforms and various equipment, please check them out:
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Some of these suppliers are not part of the SaleHoo directory but are safe to deal with. They all accept safe payment methods such as credit card and PayPal. Do try and check out the suppliers before you actually buy from them. Establish a solid line of communication and always start out small.
I was unable to locate any training material available through wholesale. For security guard training there are various sites that do offer these online. Here's one of those sites:
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Hope this helps - cheers! :)