RE: beginner bow
I would highly recommend you find a local proshop and get hands-on help. The most important aspect of a compound bow is to get fitted correcty for drawlength. Get measured properly (wingspan method) and then get a bow that is adjustable at least 1" shorter and 1" longer than this measurement.
There are lots of bows that fit this criteria, and in lots of different price ranges, too. First bow? Don't get talked into a $700 bow or anything close to it.
As I said, go to a proshop and ask questions. That's what they are there for.