Direct Subsidized Loan
As a graduate student you are not eligible for a Direct Subsidized loan.
Direct Unsubsidized Loan
The unsubsidized Stafford loan will accrue interest while the student continues to be enrolled at least half-time. The interest will begin to accrue with the initial disbursement. You can pay the interest while you are in school, during grace periods and deferment/forbearance periods, or you can allow it to accrue. Although, you must file a FAFSA to be eligible, you are not required to demonstrate financial need to receive the Direct Unsubsidized loan. The Direct Unsubsidized loan interest rate changes annually. The current rate can be found at studentaid.gov (be sure to scroll down the page to view the rates).
As a graduate student you are not eligible for a Pell Grant.
Private Alternative Loans
Private or alternative loans are available to students who are not eligible for federal loans or who need assistance beyond their federal financial aid eligibility. These loans are made through banks and private lenders and are subject to their terms.