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howto??? port translation



Can anybody help me in any means with the following:
 
  my openbsd machine needs only to operate as a firewall solution for my internal network.
 
right now i have installed IPNAT and it works almost just fine.
 
what I still want to accomplish: (this must all be done on my OpenBSD machine)
    - accces from the outside to my internal ftp-server on 192.168.0.2 port 21
    - acces from the outside to my internal ftp-server on 192.168.0.3 port 21
    - acces from the outside to my internal web-server on 192.168.0.2 port 80
    - acces from the outside to my internal web-server on 192.168.0.2 port 10080
    - consider the above as being able to open and forward ports for any service   
    - manage my OpenBSD with ssh from the outside & the inside
 
Is there any Newbie writing to accomplish all this AND turn my OpenBSD in a secure Firewall.
 
 
What i have learned so far: (please do not laugh)        :)
just learned how to edit a textfile...
setup a router, so i have internet connectivity from behind my OpenBSD with IPNAT.RULES