Answering your question, you should be specific in your provisional patent, since no new matter can be added if you later decide to file a utility patent and claim the provisional patent's earlier filing date (1 year is the deadline). Too general, and the examiner will cite many prior art references against you, you need to make your invention patentably distinct. You should think of all the embodiments that are possible with your invention, and have them in your description as well as the drawings and figures for them. If you want to learn to prepare the patent application on your own, I recommend David Pressman's "Patent It Yourself" book. Or hire a professional to write it for you. I have written quite a few provisionals, utility, and design patents for both myself and fellow inventors, it does take some experience, let me know if you have any more specific questions.
<p>Wade Sun, SunZag LLC.</p><p><a href="http://www.disceraser.com/">www.DiscEraser.com</a>Â Why shred? Recycle instead!</p>