dynamic IP questions?

[0debian user]

Hello I am connected to the net via ppp dialup connection(56k) modem. I am 
thus not always online and I get a dynamic IP when I am online. So my 
question is how can I make my machine more secure? Is there a guide/notes 
specifically tailored to someone wishing to run iptables/ipcahins on a 
single PPP connection which gets dynamic IP?  What must I do to my kernel  
and can someone explain how to setup ipmaq? When I connect to certain online 
games  I would like other players to not see my real IP/hostname. Any way I 
can proxy this?
Also I wanted to run my own web server and mail server but my machine is not 
always online so how can I do it?

Zach

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