Mars One : Mission Timeline and Facts.

Mars One has put forward conceptual plans to establish a permanent human colony on Mars by 2025, The first crewed mission from this project will be launched around 2024, if everything goes according to the plan than this not-for-profit organization based in the Netherlands will put the first humans on mars before any other space agency, as we know that NASA first manned mission to mars will launch around 2030s.

Mars One will beat NASA orion mission by a decade. It includes launching four carefully selected applicants in a Mars-bound spaceflight in 2024, to become the first residents of Mars, and that every step of the crew’s journey will be documented for a reality television program.

Mars one planned mission timeline (source)  -

2016: A supply mission would launch with 2500kilograms of food in a modified SpaceX  .

2018: An exploration vehicle would launch to pick the location of the settlement.

2021: Six additional Dragon capsules and another rover would launch with two living units, two life-support units and two supply units.

2022: A SpaceX Falcon Heavy would launch with the first group of four colonists.

2023: The first colonists were to arrive on Mars in a modified Dragon capsule.

2025: A second group of four colonists slated to arrive.

2033: The colony projected to reach 20 settlers.

there are high possibility of changes in this timeline.

it is clear that mars one will put first humans on mars but its not clear that they will send first humans around mars as another mission named "Inspiration Mars", a similarly-timed project to send a married couple on a Mars flyby and return them to Earth over a period of 500 days.

Crew for Mars One is selected by interviews, anyone over the age of 18 can apply for selection by submitting an application, nearly 202,586 applicants submitted their application for this one sided mission.