You don’t have to follow the normal rules of writing (though you can if you want). Some people might say that no one will read it if it’s written differently, but honestly, I say to hell with that. I don’t write ‘normal,’ and I love uniquely written stories. "Write what you know" is baloney, especially if you're writing fantasy or anything with fantastical elements. Research is suggested, though.
I like to post my very first, ugly drafts to get feedback. You don’t have to, but I find it useful to have fresh eyes on my work. When you do get feedback, take what resonates and toss the rest. No big deal.
Most importantly, write what you enjoy, not what you think readers want. If you love it, chances are someone else out there will too. Now, if you're aiming for actual publication, take all this advice, then tidy it up just a bit and sprinkle in a little extra fun. :)