I have 81 baseball cards from the 1940's. Would it be best to sell them as a set or one my one.?

It also depends on what condition they're in. If they're raggedy with bent corners, you'd be lucky to get five bucks a piece of them if that much. If they're in great condition they could be worth a lot. I'm uming they're Leaf (Topps didn't start until 52)