For dialogue, in fiction, the best resource is the web. There are many sites with details on how to properly punctuate dialogue. Here are just a few 8 essential rules for punctuating your dialogue, Editor's guide on punctuating dialog. You honestly can't swing a dead cat on the web without hitting one.
The information is also in style guides. The gold standard is Strunk & White and is boring as watching paint dry. Other style guides like the Chicago Manual of Style are expensive and mostly used by non-fiction.
Also, and most importantly, it is not really that important. Pick a style guide. I use the Oxford style guide, even though I'm an American in the US. As long as you are basically in the ballpark, and consistent — that is the important part — then as the author your focus is in the storytelling. If you finish are novel (or short story) and think it is good enough to share, and worthy of publishing, and want to send it to an agent, then you can hire an editor to copyedit the first chapter if you are really worried. You don't have to.
Steven King says in his book 'On Writing' that none of those details matter, only the story matters. Focus on learning to write good sentences and great stories, the punctuation details will fall in on their own as you practice more and more. The reason is that as we learn to be writers, we start noticing a lot more how published authors actually write. We soak of that minutia through our reading.
Putting off writing because you are unversed in punctuation of dialogue, or the proper use of comma, is just an excuse to not write. The thing that separates writers from non-writers is that non-writers let things put them off. Writers write.
Good luck. You can be terrific. And enjoy yourself.