Locate a place at least one foot away from the first screw, ideally up and to the side. Rumor has it that ice fractures along it's horizontal and vertical axes, so if you put the screw in up and to one side it should avoid that potential problem. (I have never even seen an ice screw fracture ice, let alone break it, so I cannot fortunately, say from personal experience on this one).
I usually use wire-gate non-locking biners.
Step 6: Clip your anchor material to each biner.
You can use a double-length (48") sling, which seems to be the perfect length for ice anchors. You can, of course, use a cordelette, or triple-length sling as well.
See Part 2 to see ways to make ice anchors on more complex terrain.
--Mike Pond, Instructor and Guide