I can't remember where or who exactly, but while seed shopping i've seen strains advertised as being bred for high CBD.
I would also suggest not a joint, but a small/moderate glass pipe. Load a bowl, take ONE good green hit, and wait about 10-15 minutes to gauge the "launch trajectory." If you feel so inclined, go ahead and take a second, but be warned: good weed hits the uninitiated pretty hard, and if you've got a bowl full of good green, 2 hits is going to be plenty the first time... possibly even a bit more than you were expecting. Try to burn the smallest possible area of the bowl, instead of torching the whole thing.
I've got ~20 years of semi-regular toker experience, and recently ended a 23 month total abstinence period... i took One hit from some really good bud, and that was enough. By the time i was again forced to enter another indefinite lapse, about a month ago, 3 hits was still plenty... probably a little more than "plenty," actually.
And, according to the accounts i've read, edibles should be reserved for experienced cannabis users. Someone who gets blowed off one good hit, is going to be overwhelmed by the intensity of edibles (unless they are an uncommonly dilute recipe).