-When I see 4/4 for wood size or something of that nature what does that mean? How can I find a size that is right for me?

-Is there anyone who could just basically explain what I have to do in order to wire a guitar (starting from scratch)

as was stated above 4/4 is a term that refers to the thickness of the wood.
wiring a guitar is a simple process. you need a soldering iron, some 60/40 solder (rosin core i believe im no electronics expert though) you basically follow simple diagrams that are posted on various websites such as www.seymourduncan.com to learn how to solder sinply google how to solder