d00d, it's easy:
1) Petrol to get there
2) Computers, Network cards, Network cables, Hub(pref a switch), Monitors, Chairs, Tables, Beanbags, Headphones, extensions, adapters, UPS, kb, mice, Score board,
3) That depends man on how many players? 1 fly lead per person, one for the server(if any) and one for the router(if any)
4) How many people do you want to invite?
5) If everyone brings their own drinks and snacks, 10 bucks each should cover the electricity and toilet flush rates.
6) Everyone HAS to bring their OWN power adapter, pc, monitor, kb, mouse, headphones, extension and pref UPS. I would suggest you have 2 or 3 external hdds with the games on them along with a "server". Server being a normal desktop that will host the games if need be. Agree before the time what games will be played when, otherwise it will cause chaos. Make sure you have the rel'vant patches and mods avail'ble for everyone. Decide before the time when it will start and when it will end. Stick to those times.
7) Snacks are more important than your computer. End. Of. Story.
![Cool 8)](./images/smilies/icon_cool.gif)
I would suggest Anti-Virus be a MUST. If the person does not have anti-virus, I suggest AVG-FREE or one of the other free flavours be freely avail'ble. Everyone thinks they aren't infected. That's why most are. Thinking doesn't work, being sure does.
9) Providing everyone has their firewalls up and don't have anything they don't want seen, shared, you should be fine. If you are still worried open WINDOWS EXPLORER, click on TOOLS | FOLDER OPTIONS | VIEW | scroll to the bottom and disable SIMPLE FILE AND FOLDER SHARING. Then go to your CONTROL PANEL | USER ACCOUNTS and DISABLE the GUEST ACCOUNT. Now a person would need to "log on" to your computer before they could see what was shared. Check your firewall, that which you don't need at the LAN, disable.
10) Those who decide on what to play must supply the games. Pref the free ones as patching and cracking is not an option at a LAN. Only retards play pirated games. If you have an original game and another guy also has an original, then you guys can play together, otherwise stick to the counter-strikes etc
11) Anything? Everything? Break a finger? Guy gets punched for fragging? Colddrink gets spilled on keyboard? Seriously? Just check, check and double check everything and you guys should be fine.
12) What about mid frag entertainment? Remember to record your demos as you can play them out at the next LAN or keep them for like, er, whatever man.
Stay off the school network. Bad idea. Really bad idea. I can't say how bad of an idea it really is. No. There should be no physical link between your LAN and the school network.
To be safe run on a silly local range like 10.0.0.X.
Hope this helps?