Morison,
Don't worry too much about the wall boxing.
Most wall sockets have colour codes at the back of them where the utp cable is suppose to connect to, this will help you wire the cable properly.
If your not to sure about, simply do a search on google.com and you will find plenty of websites to guide you through the installation.
As far as the 'normal straight cable' which you will need to connect your pc's to the hub, you can find them covered at the 'utp straight through' page. I would recommend you follow one standard throughout your lan to avoid future problems.
And closing this post, installing a print server is very simple and nothing you should be too concerned about.
When the times comes, let us know what exactly your considering doing and we will help you through it.
The file server however is slightly more complicated as it also involves implementing security and access policies - if you dont want everyone to have access to all available data on the server!
When you want to force a computer to 'join' a domain, you simply right click on the 'My computer" icon, goto the 'computer name" tab and click on the 'Change' button in order to join a domain. From there on, you will need to tell it which domain you wish to join and also use an account in the domain that has the right to join computers to it, the domain's administrator account will do this just fine.
If you dont manage to score the first time, don't worry, most people never get the first time right, and its a great learning curve.
Good luck !
Cheers
