A good starter bow for a youth would be a bow in the PSE Nova series, for example my brother was looking for a beginner bow and we stumbled across The PSE Nova's with the help of a Sporting goods store owner, We got the PSE Nova Deer Hunter, its pull back weight can be adjusted from 30-55 lbs my brother has killed several deer with it and has fallen in love with it

Its all about the person really. If you are a beginner and young you need a bow that has a wide range of adjustment in draw weight and draw length. If you are older and not going to hit any growth spirts any more than you can look for one that has less of each and fits your hand. Other important things to consider are axle to axle length brace height each make the bow more forgiving the longer and higher they are which will make learning how to shoot easier until you get the basics down. axle to axle should proabably not get below 34" and brace height below 6.5". Speed also is a very lucrative thing when you are considering your first bow. look for something around the 280-300 fps. Also find a bow that draws nicely for you and you alone after all its "your" bow. I recommend solo cams. They are more forgiving on the shoulder and draw smother than other twin cam bows. As for the rest of the equipment rest sights and quiver check with you local archery shop to get you set up and started off right. You dont need top of the line equipment for your first bow. Arrows should be reasonable after all you may lose some at first so stay on the inexpensive side. I would recommend going to your local bow shop and talking to the pro staff and the guys that are shooting in the lanes many of them have used bows for sale and you can find great deals. Stay away from big box stores. Most are just looking for the sale and will not spend the extra time to make sure everything fits you right.