New to the crossbow world.....got some questions.

I'm about ready to purchase my first crossbow and I've got a few questions. I've narrowed my crossbow choice down to the Barnett Wildcat C5. I really like the way it feels and it looks like it's built very well. I looked at a bunch of other brands but just didn't care for them. Now for the questions. I'm assuming that when I make the purchase I should get some more bolts that i will specifically put broad heads on and use for hunting only. What bolts should I get and what broad heads? How many grains? I'm new to the archery world so I don't really know a lot about this stuff. Any help would be greatly appreciated.
Thanks,
Jimmy