"First stumbling block - which do I need to split my dsl connection for a server and a couple of laptops all sharing the connection, a router (I think this is it based on the reading I've done), a switch or a hub? Also, in a nutshell, what are the differences among the three? "
I agree with the router suggestions, and the linksys product previously mentioned is really good. (great value for the money)
If you've got a little more cash to burn, you could also try the BuffaloTech WLAR-L11G-L.
(http://www.buffalotech.com/products/airstation/wlarl11l.html)
This router has 4 "wired" ports, but also serves as an 802.11b hub, so you can hook you laptops up to the network wirelessly. It uses Lucent hardware (so don't be afraid that it's a "no name" product; it's got the same guts as the orinoco stuff.)
We use it internally at work. Our dev servers & network printer are "hard wired", and we have a bunch laptops connected wirelessly. It covers 2500 sq. ft. without a problem.
It's a pretty good value for $200.
