If you're like most of us bowhunters, you're probably going to find yourself buying things, then rebuying them over and over! I've been bowhunting for quite a while and every couple of years I still end up buying something new and different just to try it. Sometimes I like it, sometimes I dont.
You're quesiton about the whisker biscuit: good rest. I definitely recommend it, especially for someone just starting out. I've been hunting for years and still use it. Keep in mind they do wear out eventually, and you have to buy the replacement biscuit, but they actually last quite awhile. I replace my biscuit every year or so, but I shoot a couple thousand arrows a season. The biscuits do work the best with the short 2" vanes, and I wouldn't use the biscuit at all with quickspin vanes, but even with some helical to them, the 2" vanes shoot just fine.
I wouldn't bother with a kisser button, thats just my opinion. Some guys like them, but if you get a good consistent anchor point with your hand, you shouldnt need one. A peep also helps that, and I would recommend you use a peep. Sounds like you got that covered. For a stabilizer, I have used a limbsavers S-coil since they came out several years back. I like it.
Broadheads are a huge topic. first you gotta decide if you want to go with mechanicals or a fixed blade. For starting out, I would recommend getting a good fixed blade. Theres a lot of good ones out there. Thunderheads have a long reputation of being good, G5 makes some good ones like the Montec that a lot of guys like, and it seems like you can never go wrong with any kind of Muzzy. You don't have to buy the most expensive, but I with broadheads, i would stay away from the cheap discount brands. they don't seem to fly consistent from my experience.
I personally use Rage mechanical broadheads, but that's just what works for me. As you shoot and hunt, you'll develop youre own preference for every piece of equipment you use. The broadhead debate goes on for ages, and if you search the archives here on D&DH youll find some pretty in depth discussions on broadheads.
With arrows, again, I would avoid the cheapest of the cheap, but most arrows at your sporting goods stores are good arrows. No need to buy the most expensive. I pay about 40-50 dollars for 6 arrows and I've had good luck. Currently Im shooting some Goldtips. They make good arrows, as does Easton, and carbon express. There are others, but those are the brands I have personally used.
definitely invest in a laser rangefinder if you havent yet. It will be one piece of equipment you'll never want to leave home without once you use one. Its good to be practiced and judging distance on your own, but a rangefinder, to me, is a must. a lot of guys use them,and I think its a wise purchase.
I think woodswalker said it, but i will too. Its all about practice, and hunting within your effective range. Practice at least 10 yards farther than you want to hunt, thats the mark I use anyway. But withiin reason. dont launch arrows at 100 yards and randomly hit targets, then shoot at animals at 90 yards! I find my max distance that Im consistant at practicing, and then back myself down at least 10 yards for hunting situations. alot of guys dont shoot deer past 30 or 35 yards, and I think thats a good rule of thumb. Deer are unpredictable, tight strung animals. a lot can go wrong when an arrow travels 35 yards to hit a deer. also, whatever you're buying, its never about the equipment. buy quality stuff that wont break on you, but beyond that, its all in your hands and how much you practice. a $200 bow, $40 arrows, and sharp broadheads kill deer just as dead as a $900 bow and $200 arrows.
believe it or not, this is my brief version of ideas! take it for what its worth, and good luck.