It consists of everything required for a Mars travel (6-9 months) Inside it will have all amenities, living space, kitchens, gym, experiments area, observation floor, many things in the upper half

In the mid section will be a bit of cargo, although most cargo will go by individual starships

Lower half will have the fuel tanks, engines, Landing legs and all necessary for an Incredible Journey

The Starship half vertically will have heat shields, to safely reenter Mars atmosphere

Its a long procedure, Inshort it is...

1. SuperHeavy and starship are at the launchpad, SuperHeavy lifts off, goes to the upper atmosphere
2. SuperHeavy decouples and starships engines fire, to achieve a stable orbit around earth, Meanwhile SuperHeavy lands back on earth
3. Now starship is in orbit, but Out of fuel, so another starship launches with only fuel, by the same SuperHeavy
4. It docks with the main starship in orbit and transfers all the fuel to fill its tank, and events back to earth
5. The Starship now fires it's engines for a trajectory to Mars, Now we just sit down and wait for 6 7 months

The landing procedure from when we touch the atmosphere of a planet to touchdown is called 7 minutes of terror

• The engines fire before reaching Mars, to slow down the rocket a bit
• We enter Mars atmosphere, ReEntry begins to heat our spaceship, now the Heat shield side is facing it
• We survive ReEntry, and are flying above Mars, thanks to its wings
• We backfire engines, and cancel the horizontal velocity, so now we are falling straight down
• When near to the surface, the landing gears deploy, Engines fire, and we slowly touchdown
• We finally landed on Mars :)