Did all my scouting on foot, I figured I was probably going too fast.
Its' a safe bet.
I bought both tags just in case I mess up on the ID of the deer, but apparently most around here are white-tail. How much niose will scare them off?
Depends on the noise. a TINY TINY amount of the WRONG noise will get you busted 100 yards away. Talking is definately one of those noises. Just for fun while we were watching some does a couple of years ago from inside the truck with the windows up, my dad said 'watch this', and gave a low whistle. I mean - it was quiet. The deer both swiveled to stare at us, ears up. And that was about 60 yards.
You want to make sure you're clothes are 'quiet'. If they sound 'natural' going thru the brush (like maybe the fur on an animals leg) then the deer will be less interseted. The forest is full of noise after all. But any 'nylon' sound and they're onto you. Even jeans are a bit loud.
I was packing an retarded amount of ammo(3 charged mags and 40 loose rounds) today and maybe that combined with talking to my friend scared them off?
er... well.... i suppose maybe the deer might turn out to have a gun too, and you'll get into a running firefight.

but generally a single mag and a few spare rounds, or two mags, would be more than adequate.
If you're talking - you're busted. Plain and simple.
I'll have to look for more water sources, I could smell/hear/feel a large one today but never found it, maybe thats the key.
Keep an eye on your back trail - if they bust you but you're downwind, they will often circle around to try to get a good whiff of you. Stop lots, and look around. Smell is huge, so keep the wind in your face or at least at a crosswind.
And remember - when you're 'scouting' you're trying to figure out where the little buggers are moving to and from each day. Whitetails will have some sort of 'circuit' worked out - if they were drinking from a pond yesterday morning, chances are they'll be back there pretty soon. That sort of thing. So look for paths, tracks, droppings, etc. Droppings will likely tend to be near a bedding area or a food area - like us they prefer to take a dump when they get up, or after they've eaten.
Once you learn what the sign means, you'll stand a better chance of understanding how they're moving in the area. If you figure that out, 90 percent of your work is done, and you'll know how to be where they're going to be before they get there. Then the odds are in your favour, and they'll pay off sooner or later. Usually sooner if you've done it right.