You can get 10+ CL by farming shadow orbs (aka "shorbs"wink in Dead Man's Shadow (DMS). DMS is a series of caves in the mountain that you find in DMP (Dead Man's Pass) of Bill's Ranch (where you rescue Stoocie). The goal of DMS is to eventually face off and fight Kamila, but it takes a long time to get to her and then beat her. xD And no one will take you until you're at least 11.5 CL. I don't know what the ring trends are, I just know that most crews need a tank and healer. Something like that.