Well, for wireless, I would suggest getting the combo I have.
Full signal everywhere in my 3200 sq ft home and even a almost full signal in my 1.5acre lot.
For a wireless adapter, get this one: http://www.newegg.com/Product/Produc...82E16833124115
and for a wireless router, this one: http://www.newegg.com/Product/Produc...82E16833124050
I have both of these, very easy to set up since I too didn't have any background or knowledge of networking. Just following the onscreen instructions and the manual, and you'll be up and running in no time.
Wouldn't suggest wireless N technology yet, stick with the mature Wireless G technology if you don't want to run into problems.
Hope this helps and good luck