The modern context menu (akin to the right-click menu on the desktop) is now a bar at the bottom. You bring up the Windows 8 context menu by swiping up. The context settings available will vary depending on the application.
Pinch-to-zoom will give you a miniature view of all the items on the Start screen, scaled to fit on a single display. Poking any app tile will return you to a normal scale view.
All of this mousing around may seem tiring, so you may want to consider using basic keyboard shortcuts for easier navigation. I won't list all the shortcuts, but here are some popular ones that ease navigation chores. Most involve pressing the Windows key plus some other key.
Windows-D: Go to the bare desktop. If you're in the Start screen, you just switch to the desktop. If you're in the desktop, it behaves like the Windows 7 hotkey, toggling between running applications and the bare desktop.
Windows Key: Switches between the Start screen and the last application used.
Windows-C: Shows the Charms bar.
Windows-R: Goes to the desktop and shows the Run dialog box.
Windows-E: Opens the computer, which enables you to use the file manager.
Windows-I: Pops up settings, where you can easily get to the Windows settings screen or shut down the PC.
Windows-X: Brings up the Simple Start menu, allowing easy access to key system-management apps, like the control panel.
Check out our comprehensive list of hotkeys, in case you're looking for more.
When you initially set up Windows 8, network drivers were installed and started. (If not, you'll need to install a network driver.) But that's just the first step. Assuming you have other PCs, you'll need to connect your Windows 8 PC to your existing network.
Assuming you have a workgroup created, you'll set up Windows 8 networking just like you did with Windows 8. The quickest way is to press Windows-D to get to the desktop, then press Windows-C. The Charms bar in the desktop is slightly different than in the Start screen in one important way: Clicking on Settings will present you with a pop-out that looks like the one you see in the Start menu but happens to list the Control Panel, Personalization and other desktop-centric settings. At this point, you can run the Control Panel, and then manage network settings there.