<<< What is the easiest way to connect the three together? >>>
The *EASIEST* way is to connect all three by ethernet cable to the router and create a "wired" network.
However, if you want a "wireless" network, you need to install a Wireless Network Adapter in the PC (either internal PCI or USB) and in the laptop that doesn't have one (PCMCIA or USB). You also need either to plug a "Wireless Access Point" into the router (effectively making it a "wireless router") or to replace the router with a wireless model. Stand-alone "Wireless Access Points" tend to be excesssively expensive and it may be cheaper to replace the router with a wireless one.
With a Wireless Network, you can mix wired and wireless connections to the router, you don't need to be "all wired" or "all wireless".