What content is required for such a petition?

G.S. 160A-104 directs that the petition describe the proposed amendments briefly and completely and with reference to the pertinent provision of G.S. 160A-101. This is the same language that is included in G.S. 160A-102, specifying the content of the resolution of intent for an amendment proposal that is initiated by the city council. The forms portion of this web page includes model language that meets the statutory requirement for each of the proposals possible under G.S. 160A-101.