Okay so this is a wiki where you make a bunch of different things so here's a list of all the different layouts and some guidelines for each of them. Make sure you insert a property template for each article you make. To learn more see Template Help or the Template tab at the top of the article.
You'll probably be making character layouts more than anything else because you need at least one character to make a story...stories aren't interesting without creatures in them! Worlds are usually inhabited...
Your character needs a Character Infobox. The text can be found at the link above. Use it to give some information about your character in short words and phrases. To learn more about this template see Templates.
Your character should have a picture, but it's not mandatory. Upload a picture of your character and put it in the image section of the infobox using the format File:picturename.jpg, png, etc. No, it does not have to be anime.
What are your characters? Male or Female? Pirate or princess? Human, elf, mermaid, or some animal? Do they use a weapon? Add "Weapon" and then the name of the weapon such as "Gun," "Dagger," or "Bow and Arrow." No plurals, please. And make sure all the articles you make have your username as one of the categories! That way every article you write is linked in one spot.
The Story Layout is the main page of your story. It will have links to all your chapters and a list of characters among other things. See the link above for a more detailed list. The main page should have the title of your story as its title. Every time you make a new chapter have it on a new page. The title of the page should be the name of the chapter.
Every main page should have the categories "Story" and then your username. The main page should also have a category with the name of the story. The chapter pages should have your username and the title of the story.
A story should have a chapter page for each chapter. If the main page of your story is called Yum then each chapter should be made Yum/Chapter #.
Each chapter should have this infobox.
Each chapter should have the category "Chapter" and your username. It should also have the name of your story (Yum/Chapter 1 would have "Yum" as a category).
Although world layouts won't be as common they're still pretty important. The link above takes you to the world layout with details about what each section should be. When making a world page the name should be the name of the world.
Each world article should have this template.
Every world should have the category "World" and your username. It should also have a category with your world name. If your world's name is Fluffy then it should have the category Fluffy. HOWEVER if your articles are centered around a story the category should be the name of the story, NOT the world.
This is the layout that should be used when creating a nation. A nation is basically a country that is part of a world.
This is the layout you should use if your creating a page for a weapon.