Never played any KH games, and finally playing it for the first time, any advices ?

Hi ! I never played any KH games and I finally decided to try out the franchise. I understood there are three "numbered" games, but over 10 games when counting the spin-offs.
I'm about to play the 1.5 + 2.5 Remix, because I was advice to do so, and starting the games by the first one. Any advice on what to do next ? Should I directly go to the 2 after ?

Anyway, I'm taking and listening any advice you can give me ! No spoil please :)