Press Shift>Option>8
By pressing the power button on the back
There is no Start button per se. Finder is the equilivant of Start on a Windows PC.
Turn it on by pushing the power button on the back left bottom of the iMac.
Finder works just like the Start button on a Windows PC.
Yes, drag and shape it or click the green button.
there is a little button you pull it up and it shows a green thingy[imac]
There is no command button on your hp laptop. I guess you are refering to the command button on an iMac or MacBook? This button is only used by Apple. That's why Windows computers (such as your HP) don't have that button. The same button on your HP laptop will be the control (ctrl) button.
Yes, it will work perfectly.
check all plugs,back left button to turn on/put to sleep.
On the iMac wireless keyboard it is the second key from the left, on the very top of the keyboard. You can also open System Preferences and then click Display. There on the Display tab you will see a brightness control slider.
Plug your camera or card reader into your mac via a usb cable. Then open up iphoto and click the import all photos button. It may take a while to import if the file sizes are larger.
On an Apple iMac, the link button in the Preview app can typically be found in the toolbar when you have a PDF or image open. Look for the icon that resembles a chain link, which may be located among other editing tools. If you don't see it, you can customize the toolbar by right-clicking (or Control-clicking) on the toolbar area and selecting "Customize Toolbar" to add the link button.