Just to list it all in point form what you need is:
The Passing, Scatter and Throw-In Templates
Three Block Dice
The Living Rulebook (from GW's website)
Two teams of your choice
I believe that's it. If you get the box set you get most of this except for the Living Rulebook which is a free download. The teams included are Orcs and Humans, good ones to start playing with.
What he said, except you may substitute the block dice with the usual D6 using a pretty common scheme
1 - attacker down
2 - both down (unless Block)
3,4 - push back
5 - defender down (unless Dodge)
6 - defender down
and some of the other things mentioned can also be substituted.