For the A1000 you will need the special kickstart disk. I was in the same position as you having bought a couple of A1000's off ebay. I managed to track down the A1000 from a supplier who provided me with a copy of Kickstart with produvtion of my Amiga serial number. Since you already have an Amiga 1000 I could send you a copy on disk plus workbench if you PM me your A1000 serial number and contact details.
TrevorDick
