I ground hunt for gun and muzzle loading seasons here and I have had a lot of luck by ground hunting, all 4 of my deer have been taken this way. I sit in one place for the duration of the hunt when i'm on the ground, even if it's all day. I'm pretty patient and have confidence in my spots when I pick em. Plus i'll freak out if I move, "well what if something is coming by right now..." those kind of thoughts I would obsess about if I moved during the hunt and I try to avoid stressing too much when I'm out there hunting, after all we are supposed to enjoy it right?! lol.
First and foremost you MUST be as close to scent free as possible. You don't have the luxury of being 15-20 ft. off the ground and at times have your scent be carried over the deer's nose anymore. Scent wicking base layers as well as "scent lok" outer layers is a good start not necessary though. Just make sure you wash everything in scent killer or an equivalent and store it in a scent free tote as soon as it dries from the dryer, or if u air dry it. I can honestly say base layers and taking extreme caution in my outer layers to be scent free has made a world of difference in my hunting experience, it's worth the little extra work.
Stay still, blend in with the woods, make a good blind, take the time to make it good. Use as much as you can, I have a very nice setup at my new spot this year and I have a lot of woods/branches behind me and to my sides, and a little bit in front of me, having stuff behind u is a lot more important than in front of you. Even if you don't like sitting a lot, make sure you have a stump or a fallen tree or something to sit on for brief periods of time, no one can stand hours on end without getting sore or antsy to sit. I have shot 2 deer standing and 2 sitting, you just have to make sure to be very slow and cautious when moving when u do, i have been busted numerous times when i thought i was alone and as soon as i stood up or sat down a deer either took off or started pawing the ground and snorting at me, not fun. Bring a back pack or something to keep your lunch and fluids in, i prefer back packs over fanny packs. Make sure its as close to sound proof as possible, zippers are unavoidable, just open them slowly, very slowly. I tend to do that at the very beginning of the hunt, in case anything is around and gets jumpy from any sounds it makes, i still have the rest of the hunt to see something else if it spooks.
If I'm going to bring a bag of chips, jerky or whatever, i bring zip lock bags and put my snacks in them at the truck before i enter the woods, they are a heck of a lot quieter than the bags most foods come in. I also open my water, or gatorade before I enter the woods that way the cracking of it opening and the carbonation sound fizzing out is already gone when I want to drink it when I get to my spot.
Don't make any noise, well, as close to no noise as possible, it may sound stupid to actually say that but I have been in the woods and have heard people coughing, snorting you name it, it makes no sense to me, be as still and quiet as possible.
Being in the air in a tree stand expands your view greatly, on the ground at times you will be lucky to see 50 yards ahead of you or to your sides. Make sure to clear some sections out, depending on the time of year go crazy clear out as much as you want, to an extent, and use the debris to manipulate trails, funnels etc.. to bring the deer to your stand, or to make your blind. Don't necessarily clear cut, but clear the area out some so you can see distant trails scrapes, rubs beds whatever it may be. The deer might be a lil more cautious when the renovations are done, but if you time it right when your in the woods the deer will be used to it and they will be comfortable walking by your stand regardless esp. if you are concealed well and virtually scent free.
Getting the shot off is one of the hardest parts. Because you have to move and make a little noise. It's even harder if the deer sneak up on you. If you can wait until the deer's head is either down, looking the other way, or behind something, then raise it your in great shape. I have lost a few staring battles when a deer has seen me raise my weapon, try to plan the motions are the right time and you will be golden.
This is just a overview and the info the other guys have given is great, I love ground hunting and prefer it over stand hunting. I'm even gonna give bow hunting a try on the ground this year when November rolls around. Good luck hope this helped!!
Them Darned ol' deer.