Linksys Cable / DSL :: X5000 Connecting Wirelessly To Network But Not Internet

I have a Linksys X5000 hooked up with my home pc.  The internet I get is free though the private school's network I work at (across the street) through a LAN.  With a bit of wrestling I got my desktop to connect with the internet through the Linksys like an ethernet switch.I can't get my wireless devices to connect with the internet without logging in as a guest, which is annoying to do every time, especially through my iPod.  They  will gain access to my network, but not the internet.
 
Since this is a school network, my IT guy gave me a static IP address to speed up up/downloads by disabling DHCP.  Every time I try to do that I get a message that "the page at 192.168.1.1 says the value can't be equal."  OK, so I try to change my router's IP to 192.168.1.2 and...no luck, same message. I love working with hardware, but networking is beyond me.  I don't think I can log into the guest screen in my own house any more!  I am getting a new tablet in 2 days and this just won't do.