Final answer:
The incident commander must develop an incident action plan after determining the desired objectives, focusing on utilizing existing resources to create a comprehensive operational strategy.
Step-by-step explanation:
Once the incident commander determines the desired objectives, they must develop an incident action plan. This involves adapt the existing means and available resources while creating and implementing an operational plan aimed at achieving the set objectives. It is not necessarily to share them with the public at this stage, nor to contact the federal government or call for additional resources, although these may be steps taken depending on the context and scale of the incident.