[NTLUG:Discuss] home networking question

[Robert Barker]

I'm getting DSL any day now and not knowing too much about how to go
about it, I want to build a home network behind a firewall.  Currently,
the plan is to create the firewall from an old P90 I have (no Xwindows -
just the basics), the firewall connects to a switch and the 3-4 pcs all
connect to the switch in turn.  I guess it would look something like
this:

  internet ----  dsl modem ----  firewall  -----  switch ----- pcs 

My questions are these:

Is this a good layout?  
The internal network is primarily for me, so I can diddle with a
php/mysql/webserver development box.  Also, I'm showing a switch over a
hub for performance.

How hard is it to set up the firewall?   I have a copy of 'Linux
Firewalls' but my questions are much more basic.  I'm talking baby steps
here - anyone up to answering some real basic questions off-line?

Finally, I'd like to thank all those who helped me with a 3DFX question
a few weeks ago.  I've been going through a job change and had the time
to resolve it that I need (or much else for that matter).  Just wanted
to acknowledge your efforts.
Thanks.

Bob