Scripts within scenes

I’m new to HA.
I created scenes that contains scripts (Entities without device).
For instance, on scene contains 2 scripts, one that turns on my TV and an another that turns on my TV decoder. Both scripts work outside the scene.
How to do it please ?
Do I need to create a script that starts 2 scripts ?
If yes, I tried but my syntax must be wrong.

Thanks a lot.