Mac Mini - Server running Lion - Network related issues

I have a mac mini running Lion.  I am having a few issues that did not exist prior to an upgrade.  But for the life of me, I can't figure it out.
The problems I'm having are as follows:
1.  screen sharing times out.  It works, then stops after a while.  If I go in and uncheck, then recheck remote management, it'll work again, but only for a while.
2.  neither the air port or the hardwired ethernet will obtain an ip via DHCP.  Works fine once I put in a static, but will never obtain a dynamic address.
3.  Homesharing on Itunes will turn off after a while, same as the screen sharing does..
4.  Time Capsule is no longer found by the Mac Mini.  My macbook pro see it no problem.  It also keeps the itunes homeshare and can get DHCP addresses fine, so I know it's not a router issue that is causing the issues on the mac mini.
Thanks
James

well to be honest I wanted a server to run more aspects of what I do privately (rather tahn at work) rather than use hosted accounts from disparate hosted providers on line. In partcular wanted a mail server to handle multiple mail domains, wiki server, web sever as per mail server and I was interested in what they would provide for iphone ipad etc as I have a few that I wanted to link to a server rather than individual macs and pcs 
I also thought that Apple might bring their abilities to creating a great UI for essentially linux operating systems to  a server os.
from initial views though it might have been easier (cheaper) to go to ubuntu and just their server version of linux. Anyway I will persist - I will read through the stuff you guys have linked me to - colinsolutions appears to have aimed me at some useful stuff. Looks like a bigger "project" than i imagined - but I havent looked at UNIX since 1986 so if I have to get into the command line it wont kill me I am sure.
thanks for the input - if anyone else can suggets good resources that would be appreciated.
ps simon - i found that the name for the server with the .local extension is visibile from the mac via finder and allows me to connect to the shared folder. so my server is sdhome - the shared resource is sdhome.local ... not sure if this helps but...

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