The Cosmic Cookie trail led me to the following post on the Mechanics of a Spell. I feel the article does a good job explaining the process of creating a spell. For myself, I would create a Sacred Space to do any planning though. I tend to meditate to receive the messages from my guides on how to proceed.
You can access the blog post at the following link: http://silverwitch.tumblr.com/post/141365221533
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