There are lots of ways to wire 3-ways. Since I can't see your setup I'll just give you the basics. Each switch has a common . Between the switches, you have to have the traveler wires. You can use your 14-2 for this. On the common screws, you have either a feed, or a switch leg . Now how you get those there is up to you. Your light has to have a neutral and should be from the same feed source not from another circuit. Another option is to install an "RF" based 3 way switching system when travelers are not available. All you need to do then is hook up the "master" switch like a normal single pole switch and the install the "accessory" switch at another location and just supply power to that switch and you have yourself an easy installed 3 way switch.
Light switches can be purchased from SparkyDirect, they have a huge range of light switches other websites offering light switches are HomeBase, argos and ebay.
Because the light is un-switch before
You can put both of the switches conected on the light
In a light switch factory......
Modern light switches are made from plastic, copper, and (maybe) coiled steel springs.
It is dependant on whether the switches are in wired in a parallel or series configuration. If the switches are wires in parallel then both switches would have to be off to turn the light bulb off. Either switch could turn the light bulb on. If the switches are wired in series then both switches would have to be on to turn the light bulb on. Either switch could turn the light bulb off.
Explain why the light is unable to reach the screen
Connect the incoming power to the line side of the GFCi outlet. Now run another wire connected to the line side of the GFCI outlet from the GFCI outlet to the switches. Power one of the switches and use that switch to turn on the 2 lights. Run power from that switch to another switch and use that switch to send power to the fan. Mount both switches in a double pole switch box. If the light above the sink has an outlet on it then you will have to connect power going to that light on the load side of the GFCI outlet. If not then just connect it to the line side.
Yes, because the light is using 3-way switches. There is always "power" travelling between the switches.
the oulets yes the switches would be a no
Dimmer switches go bad, more often than regular switches.
The single light will not come on. The traveler legs from the two switches will have to be opened simultaneously if they are not then you will get a flick of light.