For some this can be lengthy. Other perhaps not so much. I am curious to see when everyone started gaming and their progression that eventually lead them to Stadia :).
As for me:
My first Console: Atari 2600
First Game: Frogger
Replaced By : Both a Sega Master System and an NES
First Game on NES: Duck Hunt - Went straight for the gun
First Game on Sega Masters: Rambo, I think?.
Sold both for a Sega Genesis
First Game on Genesis: Altered Beast Obviously 
Purchased a used Turbo Grafx 16 and a new Super Nintendo at the same time.
First Turbo Grafx Game: Bonk's Adventure
First Super Nintendo Game: Final Fight
Traded off my Turbo Grafx and Genesis for a CD-I
First CD-I Game: I don't remember, it sucked so bad.
Traded CD-I and 600$ for a NeoGeo with 5 games.
First NeoGeo Game: Metal Slug
NeoGeo got stolen 
Traded SNES and Cash for a brand new 3DO ( Friggin loved this console)
First 3DO Game: ROAD RASH!
Trade for an Atari Jaguar: Worst Decision Ever
First Game on Atari Jaguar : Tempest.... it's only good game.
Purchased PlayStation:
First Playstation Game: Kileak the DNA Imperative
(About this time I was really REALLY into PC gaming but didn't own one yet)
Purchased a Nintendo 64
First Nintendo 64 Game: Mario 64
Sold the rest of my consoles
Purchased a used computer - 486 SX with Windows 95.
Played the HECK out of X-Wing, Command and Conquer, WarCraft, Day of the tentacle, Monkey Island, Kings quest and the list just goes on. That C&C and WarCraft music though. The power it had on me.
Upgraded my PC rig in 1998
Bought my first MMORPG - Ultima Online
The...rest...is...history.
I believe I bought an xbox but used it as a computer monitor stand.
I didn't own a console after that until I bought a nintendo switch for my son.
