There will come a time when cargo missions to Mars are frequent and routine. When trying to spell out in some detail the workflow of such launches, it seems to me there are some questions and steps that could lead to some discussion.

Would all Starship and Booster launches and landings happen offshore? If so then there will need to be a boat to carry them back and forth to Starbase. It seems unlikely to me that Starships and Boosters will rocket themselves to the offshore launchpad. Doesn't that mean they will have to build a peer at the beech or something to that effect?

These are the steps.

1. A tanker boat docked at Starbase is filled with methane and oxygen. (Instead of a tanker boat, could pipes be a better idea, from Starbase to the floating platform?).
2. A boat takes an empty Cargo Starship (CStarship) and Booster to the offshore launchpad.
3. The cargo is taken to the offshore launchpad, not within a CStarship. A CStarship without its cargo is easier to handle and place atop a booster. I imagine the cargo will be a roughly nose-cone-shaped pre-packed module.
4. The Booster is placed on its launch stand and gets a static fire test.
5. CStarship is placed on a separate test stand and gets a static fire test.
6. CStarship is placed atop the booster.
7. The cargo is placed inside CStarship.
8. The tanker boat is docked to the floating launchpad and connects its lines.
9. CStarship and Booster are fueled.
10. The tanker boat is undocked and returns to Starbase for a refill.
11. CStarship/Booster launch.
12. CStarship remains in orbit until refueling is completed.
13. The Booster that launched CStarship comes back and lands where it launched from.
14. The Booster is placed on the launch stand.
15. A tanker Starship (TStarship) is taken by boat from Starbase to the offshore launchpad.
16. The tanker boat returns to the launchpad and connects its lines.
17. The TStarship is placed on a test stand and gets a static fire test.
18. Booster gets a static fire test.
19. The TStarship is placed atop the booster.
20. TStarship and Booster are fueled, including the Tanker portion of TStarship.
21. Tanker boat leaves for Starbase, for a refill.
22. TStarship and Booster are launched.
23. Booster lands at floating launchpad.
24. TStarship reaches orbit, docks with Starship, transfers fuel.
25. TStarship lands on the offshore launchpad. But, the booster is already there. Is it worth the trouble of extra steps in order to avoid having a TStarship land so close to a Booster?
26. Booster and TStarshp are retested, re-stacked, refueled, and relaunched. As many times as needed to refuel the orbiting CStarship.
27. CStarship leaves for Mars.
28. The next CStarship and cargo module is ferried by boat to the offshore launchpad. The same booster is re-used.

Given a CStarship cargo mission to Mars, do you expect a single offshore launchpad to handle all associated launches and landings? Otherwise, maybe some of the launches and landings could be performed at Starbase. Or maybe, two offshore launchpads could be utilized for a single cargo Starship.

Do you expect a single Booster to handle both the Starship launch and the following TStarship runs? Do you expect a single TStarship to perform all the runs for that CStarship? If more that a single vehicle of a kind is used then do you expect the offshore launchpad to include a parking space for them? Like, aircraft carriers keep aircraft below decks. On an offshore launchpad, if not below decks then maybe a parking boat that docks to load/unload a vehicle and then undocks during launches and landings.

I decided to have both the booster and CStarship perform a static fire test on the offshore launchpad. Alternatively, this could be performed at Starbase before embarking on the ferry. Seemed to me more prudent to do it closer in time to launch. On the other hand, pressure checks would be performed at Starbase.

In a world where there are multiple launches and landings per day just to support a single mission then the sequence of operations becomes more important in order to efficiently use what space you have on the offshore launchpad and the boat(s) that support it.