How to stop my ship from rolling ?

The game settings have a "autoroll" setting. Turn it off to stop your ship from roliing back to the plane of ecliptic.

How to control turrets?

M ships with turrets have a small panel with control modes at the top of your HUD.

Defend Ship

Image Removed: Returns fire on anything that attacks the ship

Attack Enemies

Image Removed: Attack any hostiles

Target Target

Image Removed: Will only attack the selected target if it is hostile

Missile Defence

Image Removed: Will only try to intercept incoming missiles

Break Asteroids

Image Removed: Supports mining solid materials

See the Combat And Weapons page for info.

...