Usually, "Node" names full client, which run on server(or VPS) at datacenter.
You can start read from there - https://bitcoin.org/en/full-node#what-is-a-full-node and after - google something like "make from sources and setup full node bitcoind". And only after - read documentation, that relates to the Signatum, on github.

But...there is no money benefits, that run node...just for fun or that support network. Not more...at least now. In future - node is good solution for POS, but need strong(really very good strong) security server configuration.