Some tips that I've learned the hard way:
1) There isn't a bad bow on the market these days in my opinion. They can all fling an arrow straight at the target. The rest is up to you. My low-end kit bow costing all of $300 including sights, stabilizer, six free arrows and setup shoots in the 290's. It will shoot through a deer hit properly without a problem. How much else do you need to bring home venison? Don't spend money you don't have to just to get a name on your bow.
2) Spend lots of time shooting but don't have single marathon sessions. You'll do yourself more harm than good. Twenty "good" arrows (ones where you concentrated on what you were doing and tried to learn from each arrow released) are better than 200 arrows just sent downrange.
3) Get one of those orange sticky rifle target packs, with the two inch targets. Shoot at that. It is easier to hit a small target than a large one because it forces you to concentrate harder.
4) Instructions like using a loose hand grip, keeping the bow vertical, replicating anchor points, proper stance - you'll learn all this stuff and modify it for your own needs. Good form is important for consistency, but when hunting, you need to be flexible. Practice on your knees, on one knee, bending around things, downwards, upwards, etc. If you want to use a bow for hunting, being a good shot on an indoors range is only part of the equation.
5) Stop when you are frustrated or not having fun. Your shooting won't improve until your attitude does. Archery is partly being in a good frame of mind.
6) From my point of view, keeping "stuff" off your bow if using it for hunting is paramount to having something that forces you to be a good archer. I don't use a peep, for example. I use a two pin sight (one at 20 yards, the other at 40 yards) and a kisser button. That's it. No levels, no pendulum sights. I put the kisser in the corner of my mouth, find my anchor and put my nose on the string. Low tech, but nothing much to malfunction at a critical time.
7) Learn to range objects. I hunt the Adirondacks and getting a shot where you can fiddle with a rangefinder is rare. Again, low tech methods will stand you in good stead over a reliance on technology. "Stuff" often fails to work just when you need it.
Most of all, HAVE FUN!!! This is a recreational activity - don't take it any more seriously than it deserves.
