for your first bow, even if getting back into archery, I would not go top of the line. I would get a mid-priced bow. Your shooting style will evolve as you shoot more, and you will more than likely outgrow your bow. when this happens, you will know. Then go and shoot as many different bows as possible. Ultimately, you will find the right bow. (Our bows choose us, we don't choose our bows).
Don't get hung up on speed or draw weight. Speed thrills, accuracy kills. You will want the fastest bow you can shoot accurately. A 55lb bow is more than adequate for elk, for example.
having a properly tuned bow is critical. This means your arrows, your bow, your release, and your form are all optimized.
your bow needs to be fitted to your draw length.
your arrows, heads (field points and broad heads) must be correct for your bow. The arrow should be of the correct spine weight.
You should be using a release and a D-loop. A trigger style release is easiest to use, a hinge is the hardest, but the most accurate. (I cannot shoot a hinge, and I don't really care that I can't)
a decent arrow rest - I like a drop away, some people like whisker biscuits.
a good peep and a good sight. - I use a single pin, put a multi-pin sight is a good choice.
all of this stuff needs to work together, with you and your form.
you need to shoot a lot, then shoot some more. I probably shoot 200-300 arrows every week. On the few occasions where I don't, I get antsy. I replace my bow strings every year because I wear them out.
I recently made the mistake of trying to change a bunch of stuff with my shooting form. bad idea. Took me a few weeks to put everything back - loop length, release length, anchor points, and my grip. I was trying to change it up so that I would stop doing a trigger slap every so often. Now I simply just focus on smooth release.
I also found I had developed some cam lean, so a quick paper tune solved that.
for a first bow (or the first one in a long time), other than having the shop help get it tuned, you won't have to worry about a lot of this stuff.
I go to the trouble of fletching all my arrows identically, weighing them to ensure they're identical, etc.
in my suburban back yard, I get 20 yards for practice. The local range, that I go to every weekend, lets me shoot out to 100 yards. (The farthest I generally shoot is 80, because it amplifies every minor thing you do wrong - it humbles me enough, not to mention its a longer walk and people don't like waiting for you.)