I think about this stuff all the time. Alright, check this out.
Statistics, that is what we base things on. Science is even, "Which thing happened the most amount of times, that one is proven." So basically anything we believe in, is based on how statistically favored or possible it is.
We only know of 9 planets (minus Pluto now, so 8. Plus Colbert took part in funding a telescope that outdid the hubble, but I'm not going to count that because it hasn't been completely analyzed, and I don't think they noticed every possible thing noticeable yet I don't think.)
So we know of 9 planets, and we know that the sun is a star. The same as the stars in the sky. Maybe a little different from some, but all stars still. Statistically, what we know is: Every star is a sun, Every sun has 9 planets, 1 out of every 9 planets HAS LIFE. Statistically, even if you take out the "Every sun has 9 planets" part. It is STATISTICALLY true, that 1/9 of planets has life.
And further than that, we should not accept that water is the base for all life. That is not necessarily true. As long as something appeared on whatever mystery planet we're talking about, that was similar to plants or fungus. There is a possibility for something similar to animals. This is not at all to say that they would be anything like a human, or any animal on earth. Because in a different atmosphere, with different conditions, anything could work like water and support an earth like system. And who's to say there isn't a way for much, much different life forms to appear.
First off about their technology. Their communication would probably be SOOOO different from us. They will have evolved from something so much different than us, that trying to decipher their communication will be as hard as understanding what a plant has to say about what it feels. So we won't even recognize their base mediums for/or usage of anything.
And I'm not sure as far as the wheel. Spheres work just as good. So a civilization could have come up with the base invention of sphere instead of wheel and already be completely diverse, and advanced from ours in that way. And there could be planets with all kinds of crazy stuff going on involving the mixture of two planets information and technology. The universe is going to be even more of an adventure and discovery than when they found The America's. Like Columbus ain't got shit on whoever meets the first alien.
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