If you decide on a registered public offering, the Securities Act requires your company to file a registration statement with the SEC before the company can offer its securities for sale. You cannot actually sell the securities until the SEC staff declares it "effective," even though registration statements become public immediately upon filing.
A registration statement is NOT a fill-in-the-blank form, like a tax return. Preparing a Registration Statement requires a very experienced team consisting of at least a securities attorney and an accountant. For an example of some of the complex "form" documents that lawyers have to adapt to client needs, Jefren Publishing has posted a number of typical forms on its website.