It is worthwhile to review the trainings available from UNICEF who has developed a comprehensive training package. Although the Cluster focus is not Food Security, many of the roles and responsibilities are shared with our work.
The E-learning catalogue is here: https://agora.unicef.org/local/catalogue/index.php?filters[]=1113
You need to log-in (as guest), then filter by cluster (choose “global cluster coordination section”), and there you will find multiple IM-related trainings.