I stumbled on this amazing Video walking through the basics of Infinity: Operation Ice Storm . I have just started playing Infinity and being a long time Warhammer 40k player I can tell you that this game fills me with all kinds of nostalgia. It borrows the best of Warhammer ( The flavor) and throws in a more modernized rule set that caters to a fast and reactive game play style. Gone are the days where you simply sat back and watched your opponent decimate your forces waiting patiently for y our turn so you could return the favor.
The video below runs you through the basics in a Demo of the Operation Ice Storm starter set. Enjoy!