1000% Knight
Gender: Male
Rank: Moderators
Joined: Tue Jun 17, 2008 2:06 pm
Posts: 6932
First off, make sure you have no misconceptions: writing mysteries is
hard. But also really fun and interesting!
My advice is to plan out everything--all aspects of the crime, everything that needs to be done in the investigation, all the questions, cross-examinations, and contradictions in the trial--before starting to write. Because the end of the story is so important for mysteries, I like to make sure I have everything in the end set before I start writing the beginning. But everyone has their own style, so you just need to figure out what works for you.
In terms of writing and making it, I think the most important thing to keep in mind is
perspective. Think about the events that occur from the perspective of all of the characters--think about what they know, what they want to do, what they see, and how'd they react to it. This will help you make sure your plot is cohesive and makes sense. Then think about everything from the player's perspective--think about what the player will see, how they will probably interpret it. Think about what the player
needs to see to have the information necessary to solve the contradictions you have planned, and make sure they see it.
As for creating the mystery yourself, you need to find a way that works for you, but I personally like to "work backwards." Usually my cases start with one core idea, and then I work backwards to create characters, location, plot, etc to support that idea. (The "core idea" could be anything, like a certain trick the killer used, or a certain character you want to be the killer, or a location you want to have the murder take place at.)

Credit to Evolina for the sig+avatar!