Kindredfiles

Hello. Can anyone please give any tips or forum links wherein I could read how to optimize a server for the 'best possible' performance I could get? I'm planning on renting a dedicated server with my friends but we're not sure how to do this properly so I was hoping on getting some information before going in and spending money for rent.

How do you add mod maps to an already existing server? We are currently trying to figure out how to add 4 more custom maps to the world and we can't seem to figure out how to get it working. Does anybody have any idea how to get this working?