Beyond this helpdesk we recommend some useful tools we recommend to go through from ECHA themselves.
Firstly see the ECHA DWD IT tools user group: https://echa.europa.eu/dwd-it-user-group
This is a group of companies and stakeholders that support ECHA in developing tools such as IUCLID.
See also:
JRC Guidance document on calibrants and representative samples
List of categories for metallic materials
How to prepare a DWD Notification of intention (IUCLID notification of intention manual)
How to prepare for the DWD notification of intention and application processes (Practical guide)
As well as ECHA's 5 guidance documents:
Volume 1: Guidance on testing starting substances e.t.c. : download full PDF document
Volume 2: Guidance on accepting starting substances e.t.c.: download full PDF document
Volume 3: Guidance on scope of DWD applications: download full PDF document
Volume 4: Guidance on DWD Notifications of intention: download full PDF document
Volume 5: JRC Document: download the full PDF document from the Joint Research Centre catalogue (as above)