hi, new to macworld and lost! do NOT have access to adsl l/line, only wireless (live remote). looking for best way to set up w/less home network. have imac ipad iphone and usb modem and airport express. any help greatly appreciated please!!

peternam

Airport Express :
hi, I am new to mac home networking and live remote with only wireless internet (adsl landline not available here). have imac, ipad and iphone and need to set up home wireless network, including internet by wireless USB modem. also have an airport express. Not sure best way to bring all together - actually am quite lost! any tips or advice would be greatly appreciated please.
        iMac, OS X Mountain Lion (10.8.2), imac ipad iphone