Just a simple guide, I'll give y'all a template, Be careful if you change the display ID, I think youll need to change the type too!
Code:
INSERT INTO `gameobject_names`(`entry`, `Type`, `DisplayID`, `Name`, `spellfocus`, `sound1`, `sound2`, `sound3`, `sound4`, `sound5`, `sound6`, `sound7`, `sound8`, `sound9`, `unknown1`, `unknown2`, `unknown3`, `unknown4`) VALUES
('EntryID!', '2', '717', 'What you want your sign to say!', '0', '0', '1', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0');
Edit Blue - For Entry ID
Edit Red - For What you want the sign to say and just execute into world table and your done!
Very Simple to do and very easy.
Yeah Arc-Emu