Wireless networks require a WiFi router or hub. Open-Mesh has a fantastic set of cloud-enabled, mesh devices. These let you chain multiple WiFi units around the office or home and provide full coverage - even letting devices roam seamlessly from one Mesh device to the next. We use these ourselves and are very happy with them. Check out the Open-Mesh MR1750 Dual Band 802.11ac Access Point and the PoE adapter required to power it. You also will need a router, similar to TP-Link SafeStream TL-R600VPN. If you need a switch, consider D-Link 8 Port Gigabit Unmanaged Switch (DGS-108) A cable modem for speeds up to 200Mb is NETGEAR CM500-1AZNAS You also likely need 5-foot ethernet cables, such as AmazonBasics RJ45 Cat-6 Ethernet Patch Cables and some 10-foot cables such as AmazonBasics RJ45 Cat-6 Ethernet Patch Cable - 10 Feet.
Backing up your data - whether on a server or important desktop is critical. We use and recommend to clients the Carbonite suite of solutions. Compare online backup options here.
For website design and hosting, we often rely on the Wix hosted product suite.
And if we haven't linked to a specific product you need, shop on Amazon at their Electronic Best Sellers!