Do I leave line 1 through 13 blank? Since I am not changing anything except the 8000 credit?do I check 5405 on line 14 and put 8000 on line 14? Leave line 15 blank? Put 8000 on line 16? Leave blank line 17 through 19? Put 8000 on line 20? And put 8000 on line 21? Put year 2009 on line 22? What do I out for estimated tax on line 22?do I leave line 23 through 31 balnk since I'm not chnaging anything except the 8000 homebuyers credit?

Per the table on page 6 of the instructions for 1040X, you should fill out lines A, B, and C and also lines 6 - 22. Leave lines 1-5 and 23 - 31 blank. See: http://www.irs.gov/pub/irs-pdf/i1040x.pdf