redirect requests

hi all,
i’m using mikrotik router as a firewall server and all is fine, also i get a real IP for my MT server, so i want to access some of my hosts that acts as FTP and Web servers on my lan, so i want to access them from the internet, but i don’t want to give them a real ip like mikrotik server.
also i want to security them by mikrotik, so please give me the way that let me access them remotely.
i thinking on natting is it right ???
Please help me with a quick example.