wireless access point (a wireless networking item)
That depends on what you are attempting to do. If you are trying to access the internet, then no, a wireless router is not needed.
Fifty feet to five hundred feet. It depends on the type of access point and the physical area where it is installed.
Yes, you can.
You need to check log files while logged in to your access point.
How to Get Free Wi Fi Access Anywhere
How to Use WAP
How to Expand a Wireless Network
How to Back Up Your Router Settings