Ron Schieber, who is active over on the non-sports Net54 forum, has compiled a bunch of trade card checklists, including (I believe) one of baseball-themed trade cards. You can contact him at
madmoney@neo.rr.com and he'll hook you up, and maybe give you some suggestions on what to do with your cards. Also Ben Crane, who runs The Trade Card Place web site, used to have a pretty exhaustive collection of baseball trade cards, though I think he may have since sold many or all of them, as he's thinned out his collection. He's at
bcrane@tradecards.com.
I have some of the cards you posted, though I never really got seriously into collecting baseball trade cards despite having around 5000 trade cards of other kinds. I might be interested in buying some or all of these if/when you decide to sell. And I agree with the others who say that there's no need to have them slabbed -- that's just not something that's done in trade card collecting.