Putting those sockets around the house will give you the ability to put your modem in any room, do you want to do that or do you want to be able to plug your computer in, in any room?
If you want the latter then you need to have your modem/router plugged into the first NTE5 socket (I suggest you replace your first socket for a decent one) and then a 8 port switch plugged into that, which you then wire CAT5/CAT6 cable throughout the house to each room.
Of course, all that takes a bit of room up, with both boxes & 8 cables coming into the same place.
Or you can use a wireless router from a single point.
However a wired connection is faster & less prone to interference.
In general, your internet connection works better from the master socket than it does on extensions.
Once setup, it is far easier to use (plug our laptop in etc) the internet in any room than it is with ADSL plates in each room, as you'll have to unplug the modem/router & move it every time if not.
I'm not sure if they do phone & RJ45 mixed plates, but I did it with putting an RJ45 plate in each room as well as a phone socket.