Secure host newbie

[xilopublic1 () ca inter net]

Hi there,
  I'm going to put a host on the internet in a day or two, it will be closed to public
during the development stage.  We 
have a lot of services to setup and I was wondering about security issues for each of
these services.  We will be 
running this on a Redhat 7.3 base system.

The services we will have are HTTP (Apache), private FTP, SSH access, POP server for our
users, SMTP for users 
that would have to use ours, SSL for secure money transactions, might have news server,
might have a MP3 stream 
server and will have home-made servers for home-made clients.

Now, before I ask you guys a whole lot of newbie questions, I would like to read good
documents on these topics.  
Howtos, documentation, tutorials, books, all kinds of references are appreciated,
especially if I can get them free! 
(Since our budget is extremely limited).

Thanks,
 
Simon


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