Hi mate. i would avoid the barnett crap. you wont kill a thing with it. Why not have a look on ebay for a decent make second hand. you need to know your brace length though before you do anything as you just cant go and buy any bow and shoot it. get a ruler and with your arm outstretched (as if shooting a bow) measure the distance , in inches, from your hand to your chin. There are other ways to do this but this is the most simple method.
Good models to get are "High country", hoyt, PSE, martin and Xi
I bought a cheap and nasty model to start with and i wasted my money, well i bought 3