I'm using my pay stubs instead of my W-2 form seen as I only worked 4 weeks last year, how do I get the info I don't see?

The important information should be on your pay stubs (see list below). Anything else that is missing will not likely affect your tax calculations or tax due/refund.

Go to How do I file a substitute W-2 using Form 4852? for instructions on completing the form and filing.

Key information for Form 4852:

• gross wages paid,
• social security and Medicare wages paid (if different than gross wages),
• federal income tax withheld, 
• social security tax withheld
• Medicare tax withheld
• state wages
• state tax withheld
• local wages (if any)
• local tax withheld (if any)

Why don't you have a W2 for it?  Ask the employer for another copy.  Did they take out any taxes or withholding or deductions?