You can get lots of advice on what kind of bow and equipment to buy so I'm not going to give any advice since I'm pretty new at this myself. But I'll tell you about our experiences.
My husband's bow wore out so he bought one at Gander Mountain that had been returned. The original buyer didn't like it so my man got it at half price. It's a Browning Rampage. We got my bow at a yard sale. It's a Pro-line youth bow. It's 30 pound draw which is just right for me. Like I mentioned I'm really small, the same size as your average ten-year old girl. I have gotten two deer with it, both with one shot to the heart. No, my arrow did not go all the way through. But both deer were delicious.

(There is no minimum draw weight in Michigan which enables kids to hunt.) But you have to practice, practice, practice. It is completely unethical to hunt if you can't hit your target every time.
When you draw your bow or aim your gun, you should not be thinking about killing your deer but about hitting the target. It takes a zen like concentration and you can only achieve this through much practice.

They practice in the backyard, six shots every day.