Or check AZRank, I used it some time ago and it worked well :)
You mean that it would be some kind of currency needed to use a sign?
You could try with http://dev.bukkit.org/bukkit-plugins/azrank/, but it has no support for money
Counting players in given WorldGuard (?) region can be done.
I think that updating a specific sing is also possible, so plugin of this sort is...
Super, że jest wsparcie dla komentarzy ;)
according to first image, in second and third image you should have:
Fields 'username' and 'password' you...
Separate names with a comma.