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If you put them on Ebay.de (German Ebay), the plastic board should fetch you 100 Euros at least.
The slotted bricks can be mixed with the hollow bottom bricks (even those with cross supports). If your 1x6 and 1x8 bricks (as well as plates) in the bottom picture don't have LEGO on the studs, you can add those to the slotted bricks batch as well. The same for all the classic window with solid studs on top. This way you can advertise that entire group of parts as 1955-58 era parts. That combination of parts could fetch you $50.
And those 5 identical unique baseplates for a fire station set can be sold separately. If you're lucky, you'll get $25 for just those.
The other windows/doors and mixed parts are not going to get you a lot of money, but you could still sell it as a separate batch.