OP:
Sounds like your a bit farther along than your original post let on. That's good. So the next thing you'll want to check off is memorizing the regulations for your chosen game. It may sound excessive to "memorize" them but trust me, there isn't one hunter on this forum who doesn't know the regs inside and out for where they roam and the game they chase. Put this in the category of keeping yourself out of trouble. During hunting season the EPO deal with far too many jackwagons and truth be told, have no patience for crap - even honest mistakes. Know the property lines for the area you'll be hunting as well.
Next up - I would strongly suggest you get yourself acclimated to navigating in the woods. If you use a GPS, a smartphone app, compass, whatever... But make sure you can hit your marks. And make sure you can hit your marks if your primary means of navigation fails. If the battery in your phone dies, you wander out of a service/coverage area, know how to use a compass and map. Having a compass and map as a backup is "must have" in my book. I've had to make use of it on a couple of occasions. Rarely, but it has happened. Having them was the difference between getting out in the dark and calling for help. Remember, most of the navigating/moving you do during deer season will be in the dark. Early early AM and after closing hours in the PM. Even if you know your way around a piece of land, it's a whole new ball game in the dark and off the trail network. One wrong turn is all it takes. Don't be the guy we read about in the paper.
If your dead set on whitetail there is some equipment you're going to need aside from the weapon. A treestand is pretty much must have. A safety harness, lifeline and possibly a lineman's belt/rope as well. There are lots of options here. Whatever you choose make sure you are comfortable with your equipment. A climbing stand isn't a bad option for someone just getting started. As far as climbers go the Summit stands are hard to beat. The Summit Viper is the go-to standard in the world of climbers. If you want some additional flexibility such as getting into crooked trees, trees with limbs, etc, then you're going to want a hang on and climbing sticks. The Lone Wolf Stands and Sticks are the standard here. These stands are far less comfortable than a climber though. So that flexibility comes at a price. Staying still is a big part of whitetail hunting and a comfortable stand makes that easier. Especially for those longer or all day sits. The difference is substantial. Many a folk have fallen asleep in their Viper. No one is falling asleep in an Assault. There are other options like permanent stands such as ladder stands. But since you're just getting started you're not really going to want to go that route. Those stands are stands you leave in the woods and don't move them around. So you have to have a lot of them deployed in advance of the season. That may come with time if you choose to buy them. But for your first go, you're going to need a stand that moves around with you since it will likely be your only one.
Aside from that, scout, scout, scout, hunt.. And always respect the deer's nose. They can pick you off at well over 100 yards. And when they do they'll know pretty much exactly where you are. You'll see. This is one of those hard knocks lessons we all learn. You'll have a big boy coming in and then bam, he stops in his tracks, stomps his foot a couple of times, snorts/blows and looks at the exact tree your in. Everyone has had it happen to them. Their nose doesn't just tell them there's danger, it also tells them distance and direction! ScentBlock ain't fooling a deer's nose so don't waste your money. Learn how to play the wind. Learn how the wind flows over terrain. Learn how thermals in the AM and PM impact wind currents. Especially on light and variable days. Your success depends on your ability to keep your stank out the deer's nose, to keep quiet, and to keep still when on the stand. This more than anything else! More than the latest fancy camo pattern, fancy new deer slug, or MZ sabot, more than anything really and by a wide margin. There is no magic bullet or piece of equipment that will make you a more efficient killer. Only time, dedication, some hard lessons, and good old fashioned woodsmanship will do that.
Having someone show you the ropes helps... But it's not necessary. Keep expectations realistic and don't get discouraged. Like I said before when it comes to whitetail, the vast majority of the time you're coming home empty-handed. That's okay. Because if you wanted something easy, you would be shooting squirrels with Whacko.