Set all server's on the network to offline mode and install Bungee Cord. Then you can go here http://www.spigotmc.org/wiki/bungeecord-configuration-guide/ for the configuration guide. It tells you exactly how to set everything up. If after reading the bungee cord wiki you're still having trouble, then it would be best to leave it for a while until you're at least, say, 10 years old.
Banned forever. Reason: Attempted phishing members of MC-Market.