Warps are made public when you create them by default. In order to make them private use /warp lock

Commands you need to know about

/warp - Opens a GUI

/warp <warp> - Teleports to the player warp

/warp set <warp> - Sets a warp to your location

/warp remove <warp> - Removes the warp

/warp amount - Checks how many warps you have

/warp lock - Locks a warp

/warp rename - Renames a warp

/warp password set/remove <warp> <password> - Sets/removes password from warp

Amount of Warps according to Rank

Beginner: 1

Trainer: 2

Hustler: 2

Hotshot: 3

Expert : 4

Veteran: 4

PRO: 4

Master: 4