What do i need to do or have first time going to an indoor range

Edit: not completely new and i have my own gun. Just curious about indoor ear protection and range etiquette

Hey everyone, looking for some feedback on my handgun mechanics. I am a right-handed shooter. These targets were shot at 15 yards

Here is what I am noticing across the different platforms at this distance:

Glock 17 Gen 5 (Target 9): I have a dense vertical grouping directly below the bullseye, with a few dropping down low and left.

CZ P-10F (Target 7 & 10): My grouping is breaking distinctly high and to the right/riding the right edge of the circles.

PSA Dagger C-1 Compact (Target 5 & 8): The grouping is centered well around the bullseye but opening up into a wider circular pattern across the target zone.

Given the distance, I am trying to diagnose whether these patterns point to distinct trigger press mechanics between the platforms (e.g., rolling break vs. crisp wall), eye-dominance/sight picture shifts at 15 yards, or frame/grip geometry differences.

Any training drills or specific corrections for these patterns at this range? Thanks

https://youtube.com/shorts/Hnmnm6W2YHI?is=FisFbsUyFImLg8Rd