Please be respectful! Not everyone is as confident in their writing as you might be. Besides, we all make mistakes. Please refrain from correcting anyone’s work. It’s their piece and they should be proud of it exactly how it is.
Feel free to add people in your story but make sure you ask before writing anything that character might say or do. You might think that person would do that but it is up to the creator of the character to decide!
Stories can be as long or as short as you want it to be. They are your stories and you can write them how you want. That being said it might be wise to refrain from anything too terribly violent or lewd. Assistance on determining what is too vulgar can be requested from the Moderators.