Adopt the following format while preparing the Specification.
(a) Title of the invention.
(b) Area of the Invention.
(c) Background of the invention.
(d) Summary of the invention.
(e) Explanation about the drawings. Law does not compel you to submit drawings. But remember a good drawing can save you from pages of written description.
(f) Detailed description of the invention.
(g) Claims. This is the most important part in a Patent Specification. Please always consult an Attorney before drafting the claim.