Bow for newbie

[Rustywreck]

Most let offs aren't adjustable. I would look for 70-80% let off, especially if your hunting.
The draw weight range you mention may be a bit too high. Instead of getting something up to 80lbs, 70 should be the highest you look at.
I don't know what your states regulations are, but check them to see if there is an restricitons for let off percentage.
As far as accessories are concerned, there are so many options these days its mind-boggling.
You'll get so many different opinions regarding broadheads, shafts, etc., and all of them will be right.
If you are just starting bow hunting, it might be best to start with a mechanical broadhead. Fixed blades are my preference, but getting the to fly and hit where you want them isn't always easy for a newbie.
The first step would be to shot several different bows and find the one that you find most comfortable. People here will be glad to guide you from there.

by the way, once you start bowhunting, you'll be hooked.