Hello, thank you very much for the favorite, I appreciate it ! :3
As for the Fan Fiction writing, I'm not a pro too, I began there's about one or maybe two weeks now ! The thing is, you have to try not to make a glued text, you know, if your text seems too long, people will get bored by that.
Jumping to the next line has also the effect to change the scenes your characters where in. You can also do that when the characters are talking. You write one sentence, then skip two lines below and wright the other one ! It's pretty simple !
Also, try not to put repetitive words or situations.
And the most important rule: you HAVE to read yourself at least 5 times, it can be while you write, before submitting your fiction, at any moment ! (I do it sometimes while I write.)
Voilà, I hope it helped you, I'm sorry if it's not really clear, I wish you a good day !