Okey,I looked for a guide to make custom signs @ My server but had trouble finding. Now i figure it out and its pretty easy.
1. The object, My sign is going to be the "Aldor/Scryers" bank sign. Display for that is: 7096 (Tip: Find out display id with first target your object .Go target for asent and then .go info, I dont know mangos)
2. Go in to your database with Navicat etc. Then go to "Gameobject_Names"
3. Now we will create your sign.
Entery: Id for the sign to spawn mine will be 70024 when i do this.
Type: 1 Becouse its a sign.
DisplayId: 7096 .This is how it will look like.
Name: This is the step were you type what the sign shall say,Like "No PvP in mall etc, mine will Say "Good Luck!"
Spellfocus: 1 Dont know if its needed but mine is based on a ingame sign.
Sound: 0 can be other i think if you want them to play any music i think.
Thats about it. Image link here