:D Generic answer though it may be, it's correct.
More simply, go to Settings | Notification Server | Site Server Settings, and in there, configure a package server at each location. By default, MOST of your packages will automatically then replicate to the package server at those locations. Your clients then, most likely, will download their packages from the package server at that location, because it will respond more quickly to their requests.
If you then find that the servers are a little slow, and thus clients are trying to pull packages accross the WAN, you can further "constrain" clients to use those package servers by defining Sites. As a default rule, a client in a site will always download from a package server in their site.
Obviously, there's more to this than what I just said, but that's the short answer. You can further define things like having more than one server in a location as a backup (i.e. for your 200 user location), and you can control as well what packages get sent to each package server (on a package-by-package basis generally). This comes in especially handy for things like workstation Images (i.e. Ghost) or other extremely large packages you may not want to replicate.
But as a starter, that's all you need to know, and then you can research the rest probably, or ask here in the community of course.
Oh, and for that # of people, no, you don't need Task or OOB at those locations. The only exception to this will be if you're going to use DS in those remote locations, and then if you want to have a DS "server" in those locations, you must also have Package and TASK on the DS server. If you do imaging centrally, then this wont be an issue. Task can manage up to 5K users per server so you will be fine, though you MAY want to have another Task/Package server in the central location just to handle distribution of packages and tasks so the NS doesn't have to do that "stuff" It might be overkill for that size of an installation, but it's borderline. We generally don't like to see more than 500 task users on an NS, and you're really close to the borderline.
GL, best wishes, have fun!