https://ec.europa.eu/info/sites/info/files/proposal_for_a_re...---
Article 19, Trusted flaggers
2.
The status of trusted flaggers under this Regulation shall be awarded, upon application by any entities, by the Digital Services Coordinator of the Member State in which the applicant is established, where the applicant has demonstrated to meet all of the following conditions:
(a) it has particular expertise and competence for the purposes of detecting, identifying and notifying illegal content;
(b) it represents collective interests and is independent from any online platform;
(c) it carries out its activities for the purposes of submitting notices in a timely, diligent and objective manner.
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on a Single Market For Digital Services (Digital Services Act) and amending Directive 2000/31/EC
(50)
To ensure an efficient and adequate application of that obligation, without imposing any disproportionate burdens, the online platforms covered should make reasonable efforts to verify the reliability of the information provided by the traders concerned, in particular by using freely available official online databases and online interfaces, such as national trade registers and the VAT Information Exchange System, or by requesting the traders concerned to provide trustworthy supporting documents, such as copies of identity documents, certified bank statements, company certificates and trade register certificates. They may also use other sources, available for use at a distance, which offer a similar degree of reliability for the purpose of complying with this obligation. However, the online platforms covered should not be required to engage in excessive or costly online fact-finding exercises or to carry out verifications on the spot. Nor should such online platforms, which have made the reasonable efforts required by this Regulation, be understood as guaranteeing the reliability of the information towards consumer or other interested parties.
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Not sure about your third point yet, I've only briefly jumped around in the (lengthy) full text.