Mac or PC?
What vers of Premiere?
System Details? (OS, CPU, Drives..?)
Can you screen grab your timeline? Is it organised and tidy?
How long is it? what is your source footage?
Screen grab your OMF export settings?
What happens when you export it?
Where are you checking the export? Is it set up properly there?
Tell us this stuff and more because we are not in the editroom with you and cant see the issues you are having..
BTW - ever done this workflow before? (experience?)