Indy just gave you probably the single best tip in setting up a network. I listened to my network guy but should have even listened more. It's hard to comprehend at first why you would need more than one drop. But, here is how it happens:
You're setting up your network. Your receiptionist has a computer. She will need an Ethernet port, right. So one there. Check. But, then two months later you get her a nice laser jet printer. Networked. Two needed. Check. Then you add the networked all-in-one copier-printer-fax-scan. It obviously needs a port. Check. Then you get a credit card machine that now come with Ethernet connectors (very cool). Check. Then you get a Star Printer. After a year or so of figuring out how to connect it, it takes up another port. Check. That's one Ethernet port for five offices.
It only costs more cable and just a tad more labor to do more runs as Indy says. And, may as well go Cat6 and not 5e.
Or you can pull one cable and buy a bunch of four-port Netgear switches, which will also require an Ethernet port.
