I decided to write this journal based on how I like to write fanfics since I write them regularly throughout the week even if I don't submit everyday, I usually am writing every day despite taking forever to upload, aha (sorry xD)
So, if you're having trouble finding ideas, I suggest listening to your favourite music that may inspire you for a plot or simply re-watch a few episodes and come back to the writing later (if you haven't sunk into a black hole of fandom-yness on tumblr or something
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I would recommend writing about something you like, with your OTP or something like that (One True Pairing) like Rose and The Doctor from Doctor Who or Harry and Hermione from Harry Potter. (Not that I ship these... or I might) *cough* destiel *cough*
If you have an idea of a plot or are inspired by a song, before writing I would go on the internet and just check for fanfiction ideas that may link into what you're thinking of doing (Go on google or any other search engine you might use and see if any people have requested random fanfiction ideas based on the characters you have picked. I also tend to make sure no one else hasn't wrote anything similar to your idea. If not, great!
Once you start writing I would listen to music (again) as that's what I do but I try to lower the volume since if its too loud it can be quite distracting and depending on the song it can be quite irritating. (By distracting.. I mean by bursting out into song and ending up in the abyss of youtube at like 3 o'clock in the morning)
Remember to take breaks every now and again. Its okay to do that. I usually spend about half an hour to two hours writing a fanfic a day sometimes not finishing it until a few days later as I want my work in good quality for people to read. Some days... I just can't be bothered to write. It's perfectly normal to feel like that... I think.
I usually separate my paragraphs into four lines or so per section. I know some people write in full blocks of writing with no paragraphs but I find that hard to read and quite boring since the more you write in a block of writing, the more you're mind seems to wonder.
Short sentences. To build tension. Long sentences. To make the reader have the effect of tripping over like reading a youngsters story all excited, frantic and fast. Depending on the circumstances of writing within the plot, these can be very effective. I use it quite often. Commas are also very important. they lengthen and make the sentences easier to read with some pauses. Sometimes, I tend to over use commas, I know that. But its a simple flaw that most people put over their head
Quirky language (language devices). To get the reader intrigued such as different uses of vocabulary, punctuation and imagery.
Explore the characters identity. Its important to keep the characters vibe. I do this by re-watching some scenes from youtube of the characters I'm writing about to get a refreshed mind about how they act and speak, ect. It could be the slight mannerisms that some characters have, for example, Dean Winchester has bow legs. His knees are slightly bent outwards.. I think it is. And Sam Winchester often clenches his jaw at times. Not that I noticed.. hehe.
One of the character techniques could be using italic writing or however you'd like to write it, you can give the character thoughts within the story and visualise in the story. The depths of their mind to make the reader understand clearer. Since if you're watching something, unless there's a voice over or narrator, you don't necessarily know what the characters thinking unless they make it clear in expression. You have to make your writing simpler to how it is in your mind.
I know when I started writing a few years ago, my writing was very plain because I visualised in my mind a completely different image to what I had wrote down. You get used to writing and explaining throughout. Depending on your level of writing ad interpretation of the readers view.
Every now and again, make sure you go back and check your work. Every few paragraphs, I tend to go back through my work and edit it so when I have finished and move on, I don't have to check through the whole thing over and over since I write a lot. As you can probably tell >
Sometimes, I like to use a picture before my writing on my fanfiction to give the reader a visual statement on how the characters or the scene is set. Everyone likes pictures
I sometimes look through my older fanfics that I have already written to get a review on my writing, to see how I can improve it further. Always check the comments and see what people have thought about you're writing. I do that and once I've done writing I make sure enough detail (not too much) is put in so you can really picture the story and also speech is important too. I have learnt from the past to not structure speech in the same way all the time as it gets a bit like a script.
Try to put speech from the characters at beginning, middle and end of sentences, spreading it out in the paragraphs, remember to explain how the characters talk so the reader understands.
That's the basics of how I write any ways. I hope that helped a little, sorry if it didn't. I do try. Hopefully I included everything you need to get you writing. Have fun! :')