Network PCs & Mac via DLink Router?

[Ted]

Can someone provide a step-by-step how to Network PCs & Mac via D-Link 10/100 Router?
I've got HP and Mac accessing broadband internet via router and Insight digital modem. But would also like to transfer files and maybe share printers between the three..?
CPUs:
New HP Laptop - WinXP Home,
8500 PowerPC with G3 upgrade running OS 9.1,
and Old PC - Win95

Thanks,
Ted