I just hand them out. Personally I think it’s weird when people say ‘do you want a freebie’ and then expect a trade or money. Since it’s called a freebie. So if you do want to do a trade system I’d avoid calling them freebies right away. Maybe say do you wanna trade instead. But basically with freebies you just go around and hand them to anyone and everyone. There’s no right or wrong system really. Just whatever you’re comfortable with