Sounds good if you are trying to "sell" the story concept to a client, but since you are doing this for yourself, I'd jump right in and render each scene at the full frame rate.

You'll get a better feel for timing and flow this way.

The animatic or even a story board, will help if you are working out the flow of your story, but is not always necessary.  When I do an animation for myself, I almost always just jump right in without even a storyboard and only use a script to work from.

Best of luck with your project!

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