Yes, most definitely. They are much more reliable.
As far as their functioning capabilities the regular keyboard and the wireless keyboard are basically the same. The difference between them is that you can move the wireless keyboard anywhere you want and you don't have to worry about wires.
There are a variety of affordable wireless computer keyboards. However best buy has them ranging from 20 dollars upwards. You can also check any of your other local electronic stores for better or similar deals.
If the printer is connected to another computer via a cable, then you need something for the wireless computer to connect to. It would either have to connect to a wireless router or you could have a wireless card in the other computer and configure the two to talk to each other. But using a router is a far better solution. Then you can setup the printer as shared from the first computer and configure the two comptuers to be in the same workgroup and share it that way.
An Apple wireless keyboard may be purchased directly from Apple Store or through sources like Best Buy and Future Shop. Buying at mass retailer will usually be a better deal as they often have clearance sales.
Yes, a wireless keyboard and mouse are more practical to use because you don't have to stay in one spot to use them. You may move the mouse or keyboard anywhere you like, without being stuck in one position.
No, USB wireless cards are slower and receive a weaker connection signal than internal wireless cards.
It's a matter of choice. If you like flexibility laptop will be better for you. If you do not mind to have your computer at the same place desktop will work for you.
That depends on your preference.
Try moving the router or getting a better wireless card for your laptop or computer.
WalMart or other big box stores carry many computer supplies now. Office supply stores such as Office Max or Staples would be a better idea because of the wider selection offered on such devices.
If you do not see signal from your router, it means that the signal is not strong enough an you need to get a wireless extender or a better router.
If your looking to buy the wireless keyboard, your PC must have BlueTooth capability, but if it doesn't, or your just not sure, then you can to buy the wired one, which connects through any USB port. But don't worry if you wanted the wireless one, the wired one is better anyway (two additional USB ports, plus a full number-pad to the right.