The Guineas will be everywhere as soon as they are comfortable with their new home. Not 10 or 50 feet away either, Guineas roam far, period... it's how they are programmed: Roam/range and eat bugs, seeds and weeds. I agree with Jleigh, no matter the age they will need to be confined to their new home/goop/run set up for 6 weeks (then conditioned to come back to that coop each night, and it be made their normal routine). So if you are planning on conditioning them to come back to the coop and be safely locked in each night (which is highly suggested if you plan to sustain a flock and not feed the predators) I also highly suggest that you build their coop/covered run as far from your house as possible. 500 ft away at the barn is ideal. Believe me, this will more than pay off on the days that you have to keep them penned up for whatever reason, need to catch one, collect eggs... etc, and also by the amount of Guinea poop you won't have to clean up off your deck, porches, sidewalks etc. They will still visit your house, porch, sidewalks and yard areas etc, but you don't wan't your central area to be their central area. If you catch my drift.
Guineas are flock birds, and until you know your predator load and how efficient your dogs are (dogs are of little help if you have a high owl population in your area, which happen to very efficient at plucking Guineas right out of their roosting trees at night or early AM in my area)... so whether you may or may not be able to consistently stick to establishing the cooping up routine for your flock of Guineas I'd start off with twice as many as you eventually want free ranging your land. (I originally started with just 7, then increased to 28 for tick and snake control, and I ended up with a consistent 12 full-time free ranging on 10 acres... but also have cooped/penned breeding flocks that part time free range too tho). You can always re-home the extra birds (or send them to freezer camp) if you find that have too many for your acreage, but speaking from LOTS of personal experience I can tell you that it's way easier to get rid of a few than it is to integrate a few more/replenish an existing but dwindling flock. Guineas are very territorial and do not like newbies. The newbies take a pounding and sometimes get driven off to the point they quickly become dinner or breakfast for the predators.
As far as kinds or types of Guineas go... the common, affordable type is the Helmeted Guinea Fowl. They come in many colors/varieties tho. Pearl Grey and Royal Purple seem to do the best for a lot of people (because they are dark colored), but if your dogs are as good as you think they are, and you coop your flock each night then IMO color makes no difference. Every color and type of the common Helmeted Guinea Fowl eat bugs, ticks, weeds, seeds etc, lol.