How do u find Indian artifacts in arkansas?

my boyfriend and I live in Mississippi we are into indian artifacts! We have a place in fairfield bay near greers ferry lake and have search the creeks and overhangs of the mountains..Can anyone please tell me how to hunt them in Arkansas? What time of the year is best?and any advice on creek walking cause I have walked so much and can’t find anything.. Can u tell me what we are doing wrong and tell me how to do it? Thanks