NASA will pick certain people for the journey. The people will need to be kind and have good character. They will also have to deal with invasion of personal space due to limited space in the spaceship.
The people they choose will start to train in simulators and be checked for stable health.
Once they have completed their training they will start their 34 million mile journey to Mars.
Then they will hopefully make it to planet Mars.
Then we can hopefully start a human population on the planet.