Writing in a Particular Style

Both, I think. Immersive and arcane sound good. Feeling excited when you write is important—but plain English and good grammar help too.

But if by good grammar you mean things like not beginning sentences with 'and' and similar school rules, then you'd be better off forgetting it. At the beginning, it's good to experiment and play with different voices. Try different things and see what sticks.

 

It depends.

There's great books in all different styles. Each style has its advantages and disadvantages. Simple language doesn't necessarily mean that it's not immersive. And while point of view influences the reading experience a lot, there have been great stories (or successful) told in all different kinds of point of view (I've even heard of a couple of great 2nd person POV stories, though I've never read any).

The main things are
- write in the form you find exiting. If you enjoy writing in a rich, wordy style then go for it. If you hate writing in first person POV then stay away.
- try different things to see what works for you. Experiment and you'll see what different things do.
- research Point of view and what the benefits of the different forms are (Brandon Sanderson has some great lectures on youtube on characters and point of view, they're a good starting point).
- stay consistent within a single piece of writing (or at least a single scene / chapter).

 

To use an overused term, I think the most important thing is that your style feels authentic. It has to feel like these are your words and you are constructing sentences as they come naturally to you. Whether it is plain or flowery, anything that feels genuine and natural will always look better than something that appears stilted and forced. I personally think a thesaurus is only for emergencies and should not be used habitually.

When it comes to showing the different perspectives of characters, I think the most important thing is to chose what the characters look at and what adjectives they use to describe them. I think grammar isn't really that important for that purpose.

 

I have used different approaches to style for different books, depending on the tone of the story. A light fantasy needs something different from a gritty action novel, I think. I tend more to terse Hemingway-esque narration for the latter. And if one is writing in first person, every narrator has his or her own voice. I attempt to make those unique and perhaps succeed occasionally.

 

Oops I'm sorry I had to cut you off right there. As an "absolute beginner" you'd be much better off not overthinking style at this point. You do have to work on some things; but I'd shoot for clarity of expression, uncluttered punctuation, and correct grammar. Your style will develop on its own.

This seems like an entirely different question. This isn't style so much as approach. For instance, you could use clear, uncluttered prose to write from multiple character POVs.