Before that, think about how much easier the oceans and the Arctic/Antarctic would be to colonize.

We're a long ways off from sustainable off-planet colonies.

Undisciplined

The current NASA, and apparently Chinese plans include test, refuel and construction on the moon, and then Mars. Someone will have a human back on the moon before the decade ends. Probably China, which will light a fire for America, and others (India, UAE) to spend big. 

TNStacker

First I would think about colonizing the moon and then I would think about Mars. It is well known that if a base is established on the moon, it would be easier to send ships to other places in the system.