How to configure STATIC IP from ISP to the local network

Hello,

I have my network deployed very well.
Well, I had to host FTP and WEB MAIL SERVICES, so I purchased about three static IP adddress from ISP.

Where am I suppossed to configure this IP in the server. I just need to configure FTP on PC and the other static ip address for the mail server. I still need the (10.0.0.1 to 10.0.0.100)..the sequence if got from ISP is different and unique. how do I configure.

Please guys help me out or direct me to any articles or downloads.

Please any suggestions or comments will be appreciated.

THANKYOU IN ADVANCE