firewall + english

[nico]

hi,
ok, i don't speak very good.
I'd like to install a DMZ with firewall, wab server, mail server.
I've got 2 marchins:
- pc 166 hp avec 2G DD
- pc AMD 2Ghz avec 120 G DD.
Questions:
- which version of freebsd can i install on pc 166 ?
 Can i install mail server on my pc 166 ?
- I need a comfortable web site with many connexion. Do i install lot of 
RAM memory ?
how can i have an IP fixe ( IP stable ) free ?
- Otherwise, Where can i have install in externe web server on FAI and 
free ?
Do you understand me ?
thanks
nico