Quarterly Taxes new LLC

This March I formed an LLC in CA.  I'm trying to pay quarterly taxes estimated by Turbo Tax this year.  I've called the IRS to pay and they asked me what tax form I'm paying. Is it 1120W?  I know when I was self employed with no LLC it was 1040 because I filed the income under a Schedule C.  But now I'm told even though the LLC is just me, I will no longer be using a Schedule C.  Any insight appreciated.  Thanks.