How can I approach experienced managers for help related to a signature campaign? I'd love to explain the project in detail, giving as much information as needed, so that some trusted members in this community can verify that we have a serious project.
Most campaign managers have an announcement thread were they include their contact details (email, telegram, discord etc). You can aswell just shoot them a pm here on the forum if you prefer that.
If you scroll through the service board, you'll find reputable managers who manage multiple campaigns.