I've decided that today's post is going to be an advice post for people who are just starting their journey into fanfiction. A lot of people tend to have ideas for a story they want to write, but don't know how to write it. The way to write a story can actually be taken into several different steps.
Step 1: Have a plan. It's never good to begin writing a story without knowing what you want to write about. Always make sure you know what your story is about and where your story is going. A lot of fanfic authors, especially new ones, tend to write self-insert stories that are essentially a rendition of whatever canon story you're basing it on (Naruto, Harry Potter, Bleach, Lord of the Rings, Vampire Dairies), basically rehashing the entire canon plotline but making the main character a Gary-stu/Mary-sue. Eventually, they end up writing themselves into a corner because they realize that following the canon is no longer possible with how bad ass their main character is compared to it's canon counterpart, but don't know where to go next. So, make sure you have a plan.
Step 2: Know how your plot is going to develop. This is following in with the first step. While it's important to keep your story tree somewhat open so that you can make changes or add something you randomly thought up while writing, it's also important to plan out when certain Plot developments take place in your story. When does the Main Protagonist meet Super Villain #1? When will the Main Protagonist and Main hero/heroine meet? How soon will they fall in love? Will they fall in love? What will happen when or if they do? How many chapters will it take to defeat Super Villain #1 and what are the consequences of this villain being defeated? These are Plot developments that should be planned out in advance.
Step 3: Diverging from canon. This is important. While it's okay to use the canon plot as a basis (aka, Naruto fights Akatsuki, Icihigo fights Aizen, Harry Potter fights Voldemort), it's not okay to follow the canon to the letter. While you can do this at first to get a feel for your own writing style and story progression, at some point, you need to move away from the canon timeline and into the realm of the original.
There are other steps after this, many others, but these are the three basic steps for writing fanfiction. If you have any questions, just post them on the blog, or if any of you would like to add a step... just post it on the blog.