A lot depends on the conditions of the cards. And of course the cards are only going to be worth as much as somebody is willing to pay for them. Assuming Near/Mint Condition, these are the prices you should expect
Base Set:
Chansey - $3.50
Charizard - $40
Clefairy - $3.50
Gyarados - $3
Hitmonchan - $2
Machamp - $1.50
Nidoking - $3.50
Poliwrath - $3
Raichu - $5.50
Venusaur - $13.50
Jungle:
Kangaskhan - Having an error makes pricing it more challenging. Normally it would be $1.50.
Scyther - $5.50
Vaporeon - $2.50
Fossil:
Lapras - $2
Neo Genesis:
Ampharos - $3
Meganium - $13.50
Slowking - $4
Togetic - $5
Neo Discovery:
Hitmontop - $2.50
Houndour - $5
Kabutops - $7
Magnemite - $3.50
Politoed - $4.50
Scizor - $9
Unown A (1st edition) - $9
Neo Revelation:
Blissey - $7.50
Crobat - $9.50
Delibird - $7
Entei - $14
Ho-oh - $27.50
Porygon2 - $6
Raikou - $21
Neo Destiny:
Dark Feraligatr - $18
Dark Gengar - $15
Shining Tyranitar - $72