My old employer didn’t send my w-2 can I get one off line ?

You will need to contact that employer to get a copy.   Some employer's can get you online access, some will need to be mailed.   Contact Human Resources at your former employer and they can get you a copy - you can't e-file without the W-2.  

are you sure you were paid as an employee  - at least fica and medicare taxes were taken out of your pay. if not perhaps the employer was treating you as an independent contractor.