Answer:
I think there is life on other planets; not tall green aliens, but plant-like organisms. I can't imagine that we're the only living beings in all of space!
As I said above, I don't think that the alien life that's out there is very sentient, so I think us visiting an alien planet is more likely.
I think that setting up a colony on Mars would be a good idea for the future, so that in future space travels/missions, if something goes wrong, they can cut their travel time short and repair or do whatever they need to do on the colony instead of risking a full journey.
If humans moved to another planet or to a moon, the basic items we would need are space suits, a spaceship, tools for farming, shelter, etc.
I personally would not go to another planet if it meant I couldn't get back to Earth for 10 years. How would I know I was going to like the planet? I don't want to be miserable there for 10 years, not to mention how homesick I'd get! Plus, I'd obviously be missing ten years of everyone I know's life back home!