Welcome to the addiction:)
A few easy rules when you start:
Don't overbow yourself, that will only lead to a bad form. Start with 40 to 45 lbs max. That's plenty for killing smaller game. You get a bad form very easy, but it is long way to get rid of it!
Don't buy an expensive bow, because, once you get the hang if it, you will buy another one sooner or later.
A three pce design allows you to go up in drawweight just by ordering limbs, which is way cheaper the a new bow. A three pce Samick would be a nice choice, or take a look at the classifieds here.
Try to train with an experienced archer or even better, a coach, they can help you in getting a good form.
Once yo have a good form and you found your drawweight you can handle easily, it's time to start look around for those fancy bows