There are three parts to the enaction of a regulation:
The Initial Rule takes the law passed by Congress and disseminates it to the rest of the government. Rules can be made on any topic but only when the agency has been directed by Congress through Statutory Law. Initial rules can be found in the Federal Register, GPO Access, Congressional Universe, Regulations.gov, and at specific Agency websites.
Regulation additions or changes then have a public Comment Period.
Finally, the rule is Enacted. Once a rule is approved by the governing agency, it is incorporated into the Code of Federal Regulations.