Your capital markets team at an investment bank has been mandated by a large, traditional manufacturing client looking to issue their inaugural green bond to finance strategic transformation projects. As a member of the underwriting team, how would you advise the client and plan this issuance? Please elaborate on the key steps you would consider, potential challenges, and how you would ensure the bond's "green" credibility and market attractiveness.

你所在投资银行的资本市场部接到一家大型传统制造业客户的委托，他们希望首次发行绿色债券来为其转型升级项目融资。作为承销团队的一员，你将如何向客户建议和规划此次发行？请阐述你在此过程中会考虑的关键步骤、潜在挑战，以及如何确保债券的“绿色”信誉和市场吸引力。