Setting up an extended network from extreme with express

Hi,
Let me just explain what I am trying to do and I would love any help or suggestions.
I have the modem going into the airport extreme.  The extreme is about 30 feet away, hard wired and hanging upside down in my hallway (should it be on the wall or upside down on ceiling?) From the airport extreme I have a cable going to a 8 port hub which I have my PS3, XBOX 360, Roku, Apple TV, 3D DVD and two 3D Tv's hooked up so there all hardwired.   Another cable is coming from the airport extreme and I want to take that further into the house down the hallway and wire that into an aiport express which would then boost my signal.  Is my thought process wrong there? I know I can do all that with my airport extreme, and then putting my airport express within range of the extreme I can wirelessly extend the network but I was thinkning I could have a wifi network from the extreme and then have the airport express hardwired to boost the network instead of it boosting it wirlessly.  If I am not making sense let me know.  I had the airport express extending the network wirelessly but it was not helping at all.  Both are brand new, the extreme and the express.  The wireless clients are all new also, new macbook, macbook pro, 2009 iMac, 3 iPhone 4's and 2 iPad 2's so I am pretty sure there all wireless N devices so it should not slow down  my network right?  I have no techincal background, just learning this from reading forums etc so I am trying to give all information that I can think of thats useful.  Please ask any question and I will answer, I just hope I can figure something out.  I live in a 1400 square foot apartment so it surprises me that the extreme (new dual band etc) doesnt give me internet everywhere let alone with also having an airport express extending the network.  In the back two bedrooms and bathroom which are down the hallway and about 25 feet from the extreme have signal that is so bad that sometimes I cant even read simple RSS feeds let alone download app updates etc on my devices.  I have setup the airport extreme to have both 2.4ghz and 5ghz networks and I see them both on all devices except for my iPhone.  I have changed the channels for both frequencies by using Tumblr I believe it was and seeing what channels all the networks around me are.  My present internet speeds aer 18mbs down and 2 mb up when I am sitting next to the aiport extreme and in direct line of sight.  This also holds true on my iMac and laptops in the same room.  The laptops in the backrooms get internet and I can do more with them than my iOS devices but even on there I have a hard time streaming etc.   I am trying to get internet back there for my sons room, I have a wifi camera that I want to setup in there and so he can use an iPad there (he is 20 months which is why I want the camera) and for my room I have another Roku and Apple TV that barely get signal and are constantly buffering.
I am about to wall mount the exstreme with an airmount and am looking to permanently set everything up so please any suggestions, or hints, or things I need to be aware of please do tell. I would hate to mount everything and run the cables etc and miss something obvious.  I appreciate your guys help and thanks for taking the time to read this.
basically
modem =  airport extreme, that = (8 port hub)+(wired to aiport express) the express would then put out a wifi network to go along with the aiport extreme.

The extreme is about 30 feet away, hard wired and hanging upside down in my hallway (should it be on the wall or upside down on ceiling?
The ceiling will normally provide the best coverage in a typical room. The whole idea here is to limit obstructions between the AirPort Extreme and devices receving the wireless signal. Wall mounting can work well, again with the idea being to provide a clear signal path to devices.
Another cable is coming from the airport extreme and I want to take that further into the house down the hallway and wire that into an aiport express which would then boost my signal.
This type of configuration will provide the best bandwidth for the wireless network, and also allow you to locate the AirPort Express where it work most effectively. You want to configure what is known as a "roaming" network. The AiirPort Express will be configured using the same wireless network name, security setting and password as the AirPort Extreme. It is mandatory that the AirPort Express be configured in Bridge Mode when you do this.
Apple's instructions for this are in this link:
http://support.apple.com/kb/HT4260

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