Hi. Newbie Here. Introducing myself and needing help learning how to trade.

Hi everyone! Newbie here. Been into craft beer for awhile and have fell head over heels into the good stuff and learning to try new beers and have been loving the hunt as well. I have some good beers I've found and have drank most of them. ahaha. but still kept some for trade value as well. How does one go about trading? or what's the general best way to do it? In person, or do you mail it to someone? etc. I love it. I"m going to be going to California soon and plan on stopping at Russian River to pick myself up some good beer and hopefully extras to trade as well. I just want to share good beer with others who enjoy it and have good stories and try everything. haha. Thanks for any tips or suggestions. By the way what does BM mean? and how does one do it. I've seen alot of requests for crazy beers I've never even heard of, this seems like it's going to be fun.. thanks again.. Shane.