Is any kind of LNBs works with outernet or I have to use a specific kind of it?
If you browse the wiki, you will find the frequencies, where the outernet transmissions are in progress:
If you buy an LNB, you will get basic info about its receiving frequencies. The so called universal LNB-s here, in Eu, can recive in 10.7 - 12.75 GHz range.
If you look at the coverage page, you will see in the table next to transponder details a row called ‘Band’. It is either Ku or C (currently) and that determines the kind of LNB you need. As for Ku LNBs, there are Universal and North America Ku LNBs. These can both be used with Outernet.
You can’t use quad- and other multi-LNB setups, though, yet. Some people have used such setups, but if you don’t know what you’re doing, it’s safe to assume it won’t work.