how many coins needs for masternode?
100000 for the up-coming V1 of masternodes.
V2 will allow people to pool their efforts together to run a masternode, reducing the barrier of entry.
Can you go into more detail about the second part or link me somewhere that I can read about it? Say 20 people wanted to split a node, would they all do some hosting, or one of them would have to have a server to run it?
We don't have any details yet as V2 is in planning/design mode. Stay tuned!