Once you get the bowhunting bug, its hard to shake. Having game within bow range, <40 yards, is a very exciting and gratifying thing. Whether you get a chance to shoot or not, it doesn't matter, just knowing you outsmarted, or hunted your way inside bow range is awesome.
I agree with the above posts, don't get caught up in the hype that you "need" a 70# draw weight bow. A 50-60 pound one is plenty, you can turn it down to 50 and slowly work your way up if you desire. 30-40 is too low in my opinion, and in some provinces (Ontario for sure) you need a minimum of 45 to hunt big game legally.
If you need to lower or raise the bow away from where you are aiming in order to draw it, you are shooting too much draw weight.
Also try not to get caught up in the speed bow craze. Yes, fast arrows shoot flatter, but a fast bows are trickier to tune and harder to keep quiet. A slower, heavier arrow hits harder, penetrates better and makes a bow quieter.
When you find a bow that you like, with your friend, or at a reputable shop, if you are trying to save some $ getting started up, check the EE or shop for a used bow. Lot's of guys (including myself in the past, not so much anymore) constantly upgrade to the newest models, and there is lots of really great bows available in the used market.