Malco,
The Netgear switch you identified FSM726 is a descent switch. You'll get 2 GigE ports plus 24 FE ports. For a small office environment this will likely be way more than you'll ever need. If you're really unsure then go with
http://www.novatech.co.uk/novatech/s...tml?NGR-GS724T which gives you 24 GigE ports for a small price bump. Either switch will also allow for port trunking which means that if you need to add another switch you can use some of the existing ports to daisy chain these switches together. Or you can spend a little more money and get switches that have a special daisy chain (stacking) capability.
There are many options out there but to truly figure out the right solution you'll need to do some homework. Either have a consultant come to look at your overall requirements or if you feel ambitious you can do that but I don't recommend it if you've never done this before. You need to look at your current connectivity needs inside the office, your expansion/growth outlook, and your external connectivity needs/options/availability. All of these will drive your solution. You may find that what you need is something a little more than a simple switch. It could be a combination of dedicated switches and routers, or a hybrid (Layer 3 switch). Then you'll need to find out about DHCP/NAT/Firewalls services if your equipment doesn't handle that as some higher end more specialized equipment sometimes don't offer what your typical home cable-modems offer. That's why it is important to have consultants who've done this before and know the ins and outs of the technology do this for you.
Now, regarding figuring out which cable end goes where...again, hire someone since this is a labor intensive job, or if you really must do this yourself then get yourself a lan cable tone kit. You plug the tone generator a jack inside an office and you use your tone detector in the wiring closet. The tone detector will detect the tone being generated from the other end by waving it across the bundle and the closer you get to the tone the louder the tone gets until you hit the actual cable and the tone becomes noticeably distinct. You do this to each jack and office and every time you find the other end you label it (hence labor intensive).
Casey