In regards to the Whisker Biscuit, you will hear a lot of people bash them. Personally I am not a huge fan. BUT. . . for a cheap starter rest it is hard to go wrong. You are in the bow for free. You are out money for a rifle already, and I assume you bought a shotgun, but you said you haven't hunted yet. That said, the Whisker Biscuit is a great starting point. You don't need to worry about anything but getting started. I feel this rest will get you started for cheap and last you a good while.
Carbon arrows all the way in my opinion. I am currently shooting Easton ST's. You are looking at $60-70 for a dozen arrows this way. Some shops will even sell half a dozen.
Broad heads? That is like asking which muscle car is the best. Lots of good answers, and lots of different opinions. Tried and true Muzzy broadheads are hard to beat. Pretty cheap too. Slick tricks are my favorite but I have a 6 pack of Muzzy's waiting on my son's crossbow when his grades improve.
Just to get you hunting, I would probably just get a cheap Truglo sight at Walmart to be honest. $20-40 for a lighted sight with 3-5 pins is just hard to beat if you are just starting. That is what I had on my first bow 5 years ago and truthfully feel it was pretty good for the money. Not as nice as the sight I am using today, but I feel I could kill a deer just as dead under 35yds with one of these Truglo as the one I have on my bow.
You will want to find out some more info on the bow and get it listed here so the guys can help with info. I am FAR from an expert here, but there are guys who will be who will chime in for you.