1. You still need a seperate mine plugin, this plugin only allows you to add ranks, prestiges and rebirths.
2. Type "/rpx help" If you need a list of commands
3. The config just allows you to enable and disable everyone from using /rankup and make it so only opped players may use /rankup.
4. You still need the regular Prisons plugin and an economy plugin such as Vault.
Hope this helps