#1 Clothes and warm boots are must. I prefer layers of wool, fleece and polyproplene under garments. This is an excellent way to save money as insulated camo clothing can get pretty expensive quick. I hardly ever use any insulated garments and hunt a lot well below zero up here. I layer up or down depending on the weather and prefer a light fleece or brushed cotton as my outer wear (camo). Keeping your head, feet, neck and hands warm is a must. I like fleece hats, fleece mock, wool gloves and socks with polyproplene sock liners( plenty of hot hands) when she is cold outside.

#2 on my list to suggest: since you have a tree stand is a good 5 point saftey harness!

#3 binos are a must for hunting and scouting.
Rangefinder is a nice tool but not required to start if you are tight on a budget.
#4 Grunt tube that is very easy to operate, the true talker is one that comes with all different sounds and very simple to work or a good grunt only is the K&H EZ Grunter.
#5 Good field dressing knife, folding baldes are less weight and size. To go with your knife you' ll need a sharpening system, I would look at the Lansky kits if you are not accustom to sharpening knives.
#6 Scent control technique and practices.
a) Wash clothes with extra rinse in unscent laundry soap (Arm & hammer make a good one that also doesn' t have brighteners added)
b) Hang dry outside if possible (avoid clothes dryers)
c) A sealed containment system to keep foreign odours from pentrated your fresh washed gear. ( I use a rubbermaid container and line the bottom with field materials from the area I hunt - branches, leaves, dirt)
d) Suggest using unscent deordant & soap when showering before your hunt
e) Dress in the field
f) Have some scent elimination spray on hand to use while in the field
#7) GPS or compass
#8) A good pack (fanny or day pack)
#9) Wind checker device (either bottle with light powder or a piece of yarn works as well.
#10) A kit with bandages, tape, trail marker, flashlight, drag rope and allen key set for bow adjustments.