I just got this from a friend and need some help. I have two iMacs, one main one next to the internet connection and the other across the room. I also have a printer. OK. So how do I set this up? Which wires go where? I'd like my main computer to get the best results for internet. Can I still have direct cable access to the wall with this computer and have wireless for the other computer across the room? I must sound dumb but this is new to me. Does anyone have a good setup guide for this situation?