If I’ve counted correctly, there are: 947 officially released English 1st edition cards + 42[1] repeating misprints/variants of English 1st edition cards.
Here a rundown of all of them:
Official English 1st edition releases (947):
- Base Set: 102 Shadowless 1st edition cards
- +3 additional 1st edition Machamp variations: ‘unlimited’ ©1999 1st edition; ‘unlimited’ ©1999-2000 UK print 1st edition; Cosmos Holofoil from the 2000 Pokémon 2-Player CD-Rom Stater Set
- +1 Pikachu (both yellow and red cheeks variants)
- Jungle: 64 1st edition cards
- Fossil: 62 1st edition cards
- +2 Prerelease Aerodactyl versions (Galaxy Holofoil with brown Prerelease stamp from the US and Cosmos Holofoil with gold Prerelease stamp from Europe)
- Team Rocket: 83 1st edition cards
- Gym Heroes: 132 1st edition cards
- Gym Challenge: 132 1st edition cards
- Neo Genesis: 111 1st edition cards
- Neo Discovery: 75 1st edition cards
- Neo Revelation: 66 1st edition cards
- Neo Destiny: 113 1st edition cards
- WotC Promo: (0 1st edition cards)
- +1 #1 Pikachu (these came in Jungle packs, and there is reason to believe they were a special release instead of a misprint, based on the Japanese Trainer Magazine vol. 2 and English prototype Jungle blisters)
Unofficial variations and repeating misprints (42+?):
- Base Set:
- +1 Ghost stamp Pikachu
- +1 Dragonaite Rainbow Smear ink error
- +1 Vulpix blue butt ink error
- +16 thin vs thick stamp Holofoil Rares
- +? 2D vs 3D 1st edition stamps
- +? non-holo thin stamps
- +? black/white back stamps
- Jungle:
- +1 “d” edition Butterfree
- +1 Pinsir scratch ink error
- +1 “d” edition Eevee
- +1 Venonat ink line error
- Fossil:
- +1 Haunter stain ink error
- +1 Hitmonlee stain ink error
- Team Rocket:
- +? Smudge 1st edition stamp errors
- +? grey 1st edition stamp errors
- Neo Genesis:
- +1 Typhlosion red dot ink error
- +? grey 1st edition stamp errors
- Neo Revelation:
- +16 Holo Errors (yes, most in this linked thread are unlimited edition, but this error can also occur on all the 1st edition versions)
Best of luck completing your collection goal(s)! And welcome to the forum. 
Greetz,
Quuador
I’ve not counted the italic lines at the mentioned misprints/variants ↩︎