Yes, you Need at least 2-3 Paystubs from Your Previous  Employer..Transfer of H1b is similar to Filing the New H1b Visa Except for the fact that if u have been previuosly counted against the CAP ,u won't be counted again for the CAP. These days Even transferring the H1B is risky. If u have a legit Employer who is willing to do theTransfer prob u will be fine. These days RFE are Killing people asking all sorts of documentation(Client letter,Job iternaries,W2 of other Employees who r working with u etc etc). So first thing Get a Job from a Legit Employer(Not Consultants). Then file for Transfer.