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You don't need -server in the conf file.
Yes, it's easy to run a bitcoin node.
Make sure that you open port 8333(or UPNP is enabled and is supported by your router)
Does it require the 8333 port as RPCAllow is running on 8332 today?
You usually dont want others to make RPC calls on your node, so thats not important.
The things that are important in order to help the network the most are:
- keep the node running as it will take time to build up on connections and its the best way to keep it synced
- make sure the port 8333 is reachable from the outside. You can test the settings e.g. via bitnodes[1]
other than that you are all set. You might want to install a tool to limit the bandwidth bitcoin core/qt is using as it might lag the other machines that are using the same line if someone is downloading large parts of the blockchain from you.
[1]
https://getaddr.bitnodes.io/