Lots of gauss for short range mass firerate, and AMMs for longer range point defence systems, also do not feel you always need to take fights and look at the strategic overview before comitting half your fleet to an action that will yield you very little. I will be making in the future more videos around ship combat and doctrine as well as philosophy on taking engagements and the like, but I am glad the video helped you get your first experience, and PS trial and error is your best friend in aurora, you will get it at some point
To help fastrack you a bit and add to this - volume of fire is your friend when using gauss since most shots will miss. For point defence missiles - you only need a warhead strength of 1 to knock out a missile, speed and agility are king, range is secondary.
Later on you might find that enemy missile possess high levels of ECM so you will need ECCM on fire controls and missiles meant to go after other missiles