Help with barcode creator software

I’m trying to find software for my business and I don’t know what it’s called that I’m even looking for. I’m trying to create barcodes quickly from a pad that I can send to a wireless printer, again, quickly, and then once they are scanned by our register, they are bull and void. So basically, looking for a program/app that will go into the pad and then a one that I can load onto my pos so that I can pay them out once printed