Any thoughts/ideas welcomed

This is kind of a weird, general question, but is there a general non-macro econ guideline to pricing things? Friends moved and couldn’t fit everything so it ended up at my house. I’m freecycling most of it which has little to no value (or actually, if no one responds, I may have a garage sale). Some things have (to my eye) real value (i.e., silk screens in wood frames, light stands, a Nikon F4 lens etc.) but I have no idea what a reasonable price would be. I’m not looking to make huge $ but I don’t want to do my normal $1 per item stuff either.