How Do I Magic?

I hope I'm ok to post this here? If not I aplogise.

I've started playing RS3 in the last few weeks. I used to play as a kid almost 20 years ago and a little bit here and there over the years but I've made a new account and I'm really getting into it.

I'm just over 70 hours in and havent done anything to increase my Magic level (other than xp lamps). I cant wrap my head around what I should be doing. My magic level is only 12 at the time of writing this. I've equiped myself with an Imp Horn Wand and Imphide book as well as various different runes.

My question is, how should I be implementing my magic combat spells as it seems my basic abilities are able to take care of enemies no problem without them? Is it something I even need to worry about at a low level as they will be more important/beneficial at a higher level?

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Thank you! :)