Q: cant locate my iphone on find my iphone app, what else can i do to find it?

You can't, not until it goes back online.  You can try looking for it and/or calling your number to see if an honest person who found it would answer.

Place it in lost mode (see http://help.apple.com/icloud/#/mmfc0f0165).  You will be notified by email if and when it goes back online.  Then change your iCloud password to prevent someone who may find it from taking over your iCloud account: http://support.apple.com/kb/PH2617.

Also read this: http://support.apple.com/kb/HT5668.