Be sure to get arrows that are CORRECT for the bow and the configuration of the bow.
There are many to choose from and some "pro shops" will suggest an arrow but it may not be the best for your bow. yes, some guys will be spot on their recommendations, some not so much. I like to use pinwheel software to play around with arrow configurations so i can see what they arrow will do before I buy the arrows.
You can get the software from here -
http://www.pinwheelsoftware.com/ Download the SFA trial - you'll get a 30 day trial. Select the bow and put in the draw weight, length, etc... do NOT change the cam settings. Let them be what the app sets them to.
There's more stuff to set in the program but it isn't necessary right now. Main thing is to play around with the arrows and find the arrow that fits the bow. If you have the wrong arrows, you'll be fighting tuning issues more than you should and will probably get frustrated. If you need help with that PM me and I'll help you out. Be sure to put in the weight on the string, fletchings, inserts and nock weights. this all helps with getting the arrow.
The software has been very accurate for my two bows as far as getting the arrow/length/point weight and all that set where tuning becomes very easy.
There's a lot more as far as tuning goes but that can be for another time. You asked about gear.
Release - probably wouldn't hurt to have a spare. Especially if you travel to hunt. Never know when one might break or get lost.
Depending on the bow, you might need to use some string silencers to help quiet the bow down.
String wax - get it and use it. It will make your string last longer.
Target - personal preference I guess. I stay away from the layered block type of targets. I shred them up too quickly. I have a good bag target and a rhinehart block target and a 3d target (mckenzie).
I like using trail cameras but nothing beats scouting and seeing the activity with your own eyes.
I don't worry too much about using stuff like scent lock and sprays - while I think it helps to a point, I play the wind more than anything.
Flashlight/Headlamp - get a good one. I like the headlamps since it keeps your hands free. Nothing worse than trying to field dress a deer in early season while holding a flashlight and fighting skeeters.
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You can always get into using rattling antlers, calls, scents, etc.... I have had some success (meaning deer responding to) - calls and rattling. Believe it or not, I got a buck to turn around and come back just by making an "uuuuurrrrrppppp" sound. No, it wasn't gas that was passed either. I didn't have any calls with me but darn if he didn't turn right around for me.
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I will wash my hunting cloths in scent free detergent and store them a scent proof bags.
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Here's a good resource to read through.
http://archeryhistory.com/archerytalk/The_Nuts&Bolts_of_Archery.pdf
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Get some moleskin to put on the shelf of the bow. Nothing worse than having an arrow tap the shelf area and make noise at the worse possible moment.
learn to tie the dloops and keep a few extra on hand. never know when one might fray and snap.
If you are going to hunt out of a tree stand - be sure to wear a safety harness. too many people fall out of trees and get seriously hurt or killed.