As I've suggested before, they could even put another space station or two between the Earth and Mars and then just leapfrog there, a step at a time, to conserve and accumulate supplies for the colony.
Yeah, um, you're going to have to explain that a little better. The closest we can get to "putting a spacestation between Earth and Mars" is to build one at one of Earth's lagrange points. It's not like Earth and Mars sit in one place and you can just build a station at the halfway point between them. They orbit the sun at different rates and are constantly moving in relation to each other.