So, you want to go for law school.

It is a good decision. You had mentioned that you have not a good credit history and you are on credit cards and on student loans. dst1 told you a good way , i.e. SalieMae is a good choice and if you show honesty to the people then there is possibility that you will get the loan. Other than these try your luck on federal loans.
Graduate PLUS Loan can be completed in three ways. A School initiated process, where the student completes the PLUS application and returns to ISU for processing, and two types of borrower initiated process via the web or by phone.
1:
School Initiated Graduate PLUS Loan ProcessYou need to complete Grad PLUS application, and returns application to Office of Student Financial Aid for processing.
If you want to know the eligibility then call chosen lenders toll free number to determine whether they qualify for the Grad PLUS Loan.
If you are a first time borrower, you will receive notification from the lender/guarantor to do an electronic PLUS MPN on the web or a paper PLUS MPN.
If you denied due to a credit check, they are not eligible for any additional Stafford Loans
2:
Borrower Initiated Graduate PLUS Process on the web
You need to go to Office of Student Financial Aid MPN website
Then click on the lender link to do the Grad PLUS application
To determines their eligibility for Grad PLUS Loan on the web
If you are first time borrower, you will receive notification from the lender/guarantor to do an electronic PLUS MPN on the web or paper MPN.
If you is denied due to a credit check, they are not eligible for any additional Stafford Loans
3:
Borrower Initiated Graduate PLUS Process by phone
You need to call toll free number of lender to initiate PLUS Loan.
Lender takes student information over the phone to initiate application process.
If it is your first time, you will receive notification from the lender/guarantor to do an electronic PLUS MPN on the web, or paper MPN.
Best of Luck!