Can I get an Advance on my inheritance while it is in Probate? And if I can do I have to pay a company to do it for me or can I submit paperwork

One difficulty is that the lender has no way of knowing what you will actually receive because the lender does not know what debts (including taxes) must be paid first.  These include the decedent's final year of income taxes. Some Wills permit the executor to make partial distributions before paying all the debts.  You might ask.