You can see all satellite channel listings at www.lyngsat.com
Sky News broadcasts from the Astra 2 cluster located at 28.2 degrees east of the southern meridian. I think that Euronews also still has a channel on that satellite. If not, try Hot Bird satellite located at 13.0 degrees east of the southern meridian. I think that it carries both of those so-called "news" channels, as well as numerous German programmes.
To set up the system, first align the dish on the required satellite(s). Although it's theoretically possible to do this with a £5 meter off eBay, in practice it's much easier to use a proper meter costing from around £300, since this type displays the name of each satellite and removes the guesswork. The dish needs to be aligned to an accuracy of less than 0.5 degrees in order to get a good, reliable signal. Since tightening the bolts can easily move it by 0.5 degrees, it might need a couple of tries to get it exactly right.
Once you are certain that the LNBs are aligned on the desired satellites, connect them to a DiSeQc switch - noting which inputs you use - and connect the switch to the drop lead that's connected to your receiver.
Then set the receiver to select the correct DiSeQc switch input for each satellite and let it scan. If you simply make guesses, prepare to be disappointed; you need to know what you are doing. If the receiver has the option, set it for a "universal" LNB, because that's what you're using in Europe. http://www.satcure.co.uk/tech/lnb.htm