Mission Scenarios
mars-sim borrows from a variant form of the Mars Direct plan proposed by Zubrin and Baker in 1990s.
Run the ‘Mars Project Starter’.

Screenshot of the Mars Project Starter
In the Main Menu, choose ‘Customize Scenario’ to open the Scenario Editor (also called Simulation Configuration Editor).

Screenshot of the Simulation Configuration Editor
By default, you are presented with numerous settlements, each having a predefined phase such as a Mars Direct Base Phase 1, Phase 2, Phase 3, Alpha Base, Hub Base, Sector Base, etc.. You are free to reconfigure this template.
In version 3.1.0, users may designate a space agency (as a sponsor) for each settlement. Note that the names of the settler will be auto-generated to suit his/her national origin.
In terms of resupply mission, for a Mars Direct Base Phase 1, the built-in resupply schedule will send one new mission each Martian year (668 or 669 sols) for the next 3 years to replenish existing settlements.
The Resupply Tool will provide players the ability to tweak the launch/arrival date, the number of settlers and the type/ quantity of supplies (including buildings, equipment, vehicles, resources, and parts).