Quickstart / point me in the right direction

[elgholm]

Hi!

I just installed a new server in our server-farm and promised my sons to setup a working minecraft server for them. I thought MC Server looked nice.

I downloaded src, compiled, installed, setup, started.
All working. Good.

Now what?

Please tell me some cool stuff todo.. What plugins should a install? What cool settings/setups should I try? Can I download some pre-made cool worlds and make spawnpoints to them? etc. etc..
I don't play mc myself, but I have 3 sons (!) who do, and I haven't got a lot of time just browsing around not knowing what to look for.

By the way, the server is fairly strong, so if you're interested I can probably host a couple of thousand users.

Cheers!
/Charlie