Welcome New Comer,
1st. Find a Source and Edit the Client.java to your liking.
2nd. Find a Good client that you like and edit that client.java
3rd. "Run" the "Compiler.bat" in the source.
4th. Then "run" the "run.bat" in source
5th. Then to see if server works go into your client folder.
6th. "Run" the "Run.bat" in the Client
7th. Login with your username and password and put ur Localhost IP in ur Client.
8th. your localhost is "0.0.0.0" or "127.0.0.1"
9th. it should work if anymore help Reply to your topic.
10. Have FUN!!